Exodus 8:27

• Moses explained why Pharaoh’s request could not work. He said it would offend the Egyptians. The Egyptians looked down on the Hebrews and other Semitic peoples. They considered them uncultured and unclean (see Genesis 43:32).

• The Hebrews were leaving Egypt in order to worship the Lord (see, for example, Exodus 5:1; 7:16; 8:1, 20). God’s purpose in the exodus was not only freedom from slavery. He wanted to bring his people into a right relationship with him.

The fourth plague was the plague of flies. The Egyptians worshiped insects such as flies that seemed to be able to turn death into life, as their young seemed to emerge from decaying matter. If the Egyptians thought that insects had the secret of life, God would let them have all the insects they wanted. Some say that this infestation was the natural result of all the dead frogs, but there were no flies in Goshen (8:22), the northeastern delta area where the Hebrews lived. God’s miraculous power was clearly seen in his ability to infest one area while sparing another at will.

Pharaoh called for Moses, . . . Go ye, sacrifice to your God in the land, &c.--Between impatient anxiety to be freed from this scourge and a reluctance on the part of the Hebrew bondsmen, the king followed the course of expediency; he proposed to let them free to engage in their religious rites within any part of the kingdom. But true to his instructions, Moses would accede to no such arrangement; he stated a most valid reason to show the danger of it, and the king having yielded so far as to allow them a brief holiday across the border, annexed to this concession a request that Moses would entreat with Jehovah for the removal of the plague. He promised to do so, and it was removed the following day. But no sooner was the pressure over than the spirit of Pharaoh, like a bent bow, sprang back to its wonted obduracy, and, regardless of his promise, he refused to let the people depart.




Next: Exodus Chapter 9

Here is the story of the plague of flies, in which we are told,
I. How it was threatened, like that of frogs, before it was inflicted. Moses is directed (Exo 8:20) to rise early in the morning, to meet Pharaoh when he came forth to the water, and there to repeat his demands. Note, 1. Those that would bring great things to pass for God and their generation must rise early, and redeem time in the morning. Pharaoh was early up at his superstitious devotions to the river; and shall we be for more sleep and more slumber when any service is to be done which would pass well in our account in the great day? 2. Those that would approve themselves God's faithful servants must not be afraid of the face of man. Moses must stand before Pharaoh, proud as he was, and tell him that which was in the highest degree humbling, must challenge him (if he refused to release his captives) to engage with any army of flies, which would obey God's orders of Pharaoh would not. See a similar threatening, Isa 7:18, The Lord will hiss (or whistle) for the fly and the bee, to come and serve his purposes.
II. How the Egyptians and the Hebrews were to be remarkably distinguished in this plague, Exo 8:22, Exo 8:23. It is probable that this distinction had not been so manifest and observable in any of the foregoing plagues as it was to be in this. Thus, as the plague of lice was made more convincing than any before it, by its running the magicians aground, so was this, by the distinction made between the Egyptians and the Hebrews. Pharaoh must be made to know that God is the Lord in the midst of the earth; and by this it will be known beyond dispute. 1. Swarms of flies, which seem to us to fly at random, shall be manifestly under the conduct of an intelligent mind, while they are above the direction of any man. "Hither they shall go," says Moses, "and thither they shall not come;" and the performance is punctually according to this appointment, and both, compared, amount to a demonstration that he that said it and he that did it was the same, even a Being of infinite power and wisdom. 2. The servants and worshippers of the great Jehovah shall be preserved from sharing in the common calamities of the place they live in, so that the plague which annoys all their neighbours shall not approach them; and this shall be an incontestable proof that God is the Lord in the midst of the earth. Put both these together, and it appears that the eyes of the Lord run to and fro through the earth, and through the air too, to direct that which to us seems most casual, to serve some great designed end, that he may show himself strong on the behalf of those whose hearts are upright with him, Ch2 16:9. Observe how it is repeated: I will put a division between my people and thy people Exo 8:23. Note, The Lord knows those that are his, and will make it appear, perhaps in this world, certainly in the other, that he has set them apart for himself. A day will come when you shall return and discern between the righteous and the wicked (Mal 3:18), the sheep and the goats (Mat 25:32; Eze 34:17), though now intermixed.
III. How it was inflicted, the day after it was threatened: There came a grievous swarm of flies (Exo 8:24), flies of divers sorts, and such as devoured them, Psa 78:45. The prince of the power of the air has gloried in being Beelzebub - the god of flies; but here it is proved that even in that he is a pretender and a usurper, for even with swarms of flies God fights against his kingdom and prevails.
IV. How Pharaoh, upon this attack, sounded a parley, and entered into a treaty with Moses and Aaron about a surrender of his captives: but observe with what reluctance he yields.
1. He is content they should sacrifice to their God, provided they would do it in the land of Egypt, Exo 8:25. Note, God can extort a toleration of his worship, even from those that are really enemies to it. Pharaoh, under the smart of the rod, is content they should do sacrifice, and will allow liberty of conscience to God's Israel, even in his own land. But Moses will not accept his concession; he cannot do it, Exo 8:26. It would be an abomination to God should they offer the Egyptian sacrifices, and an abomination to the Egyptians should they offer to God their own sacrifices, as they ought; so that they could not sacrifice in the land without incurring the displeasure either of their God or of their task-masters; therefore he insists: We will go three days' journey into the wilderness, Exo 8:27. Note, Those that would offer an acceptable sacrifice to God must, (1.) Separate themselves from the wicked and profane; for we cannot have fellowship both with the Father of lights and with the works of darkness, both with Christ and with Belial, Co2 6:14, etc.; Psa 26:4, Psa 26:6. (2.) They must retire from the distractions of the world, and get as far as may be from the noise of it. Israel cannot keep the feast of the Lord either among the brick-kilns or among the flesh-pots of Egypt; no, We will go into the wilderness, Hos 2:14; Sol 7:11. (3.) They must observe the divine appointment: "We will sacrifice as God shall command us, and not otherwise." Though they were in the utmost degree of slavery to Pharaoh, yet in the worship of God, they must observe his commands and not Pharaoh's.
2. When this proposal is rejected, he consents for them to go into the wilderness, provided they do not go very far away, not so far but that he might fetch them back again, Exo 8:28. It is probable he had heard of their design upon Canaan, and suspected that if once they left Egypt they would never come back again; and therefore, when he is forced to consent that they shall go (the swarms of flies buzzing the necessity in his ears), yet he is not willing that they should go out of his reach. Thus some sinners who, in a pang of conviction, part with their sins, yet are loth they should go very far away; for, when the fright is over, they will return to them again. We observe here a struggle between Pharaoh's convictions and his corruptions; his convictions said, "Let them go;" his corruptions said, "Yet not very far away:" but he sided with his corruptions against his convictions, and this was his ruin. This proposal Moses so far accepted as that he promised the removal of this plague upon it, Exo 8:29 See here, (1.) How ready God is to accept sinners' submissions. Pharaoh does but say, Entreat for me (though it is with regret that he humbles so far), and Moses promises immediately, I will entreat the Lord for thee, that Pharaoh might see what the design of the plague was, not to bring him to ruin, but to bring him to repentance. With what pleasure did God say (Kg1 21:29), Seest thou how Ahab humbles himself? (2.) What need we have to be admonished that we be sincere in our submission: But let not Pharaoh deal deceitfully any more. Those that deal deceitfully are justly suspected, and must be cautioned not to return again to folly, after God has once more spoken peace. Be not deceived, God is not mocked; if we think to put a cheat upon God by a counterfeit repentance, and a fraudulent surrender of ourselves to him, we shall prove, in the end, to have put a fatal cheat upon our own souls.
Lastly, The issue of all was that God graciously removed the plague (Exo 8:30, Exo 8:31), but Pharaoh perfidiously returned to his hardness, and would not let the people go, Exo 8:32. His pride would not let him part with such a flower of his crown as his dominion over Israel was, nor his covetousness with such a branch of his revenue as their labours were. Note, Reigning lusts break through the strongest bounds, and make men impudently presumptuous and scandalously perfidious. Let not sin therefore reign; for, if it do, it will betray and hurry us to the grossest absurdities.

Exodus 8:20-27

20. And the Lord said unto Moses, Rise up early in the morning, and stand before Pharaoh, (lo, he cometh forth to the water,) and say unto him, Thus saith the Lord, Let my people go, that they may serve me:

20. Tunc dixit Jehova ad Mosen, Surge mane, ac te siste in conspectum Pharaonis: Ecce egredietur ad aquas: et dices ad eum, Sic ait Jehova, Dimitte populum meum ut serviant mihi.

21. Else, if thou wilt not let my people go, behold, I will send swarms of flies upon thee, and upon thy servants, and upon thy people, and into thy houses: and the houses of the Egyptians shall be full of swarms of flies, and also the ground whereon they are

21. Quod si tu non dimiseris populum meum, ecce emittam in te, et in servos tuos, et in populum tuum, et in domos tuas examen insectorum: et replebuntur domus Aegyptiorum insectorum examine, atque etiam terra super quam illa extiterint.

22. And I will sever in that day the land of Goshen, in which my people dwell, that no swarms of flies shall be there: to the end thou mayest know that I am the Lord in the midst of the earth.

22. Et separabo in die illa terram Gosen, in qua populus meus habitat, ne sit illic examen insectorum, ut scias quod ego sum Jehova in medio terrae.

23. And I will put a division between my people and thy people: tomorrow shall this sign be.

23. Et ponam redemptionem inter populum meum, et inter populum tuum: Cras erit signum hoc.

24. And the Lord did so: and there came a grievous swarm of flies into the house of Pharaoh, and into his servants' houses, and into all the land of Egypt: the land was corrupted by reason of the swarm of flies

24. Et fecit Jehova sic: et venit examen insectorum grave in domum Pharaonis, et domum servorum ejus, et totam terram Aegypti: corrupta fuit terra propter examen insectorum.

25. And Pharaoh called for Moses and for Aaron, and said, Go ye, sacrifice to your God in the land.

25. Tunc vocavit Pharao Mosen et Aharon, et ait, Ite, sacrificate Deo vestro in hac terra.

26. And Moses said, It is not meet so to do; for we shall sacrifice the abomination of the Egyptians to the Lord our God: lo, shall we sacrifice the abomination of the Egyptians before their eyes, and will they not stone us?

26. Et dixit Moses, Non convenit facere sic: quia abominationem Aegypti sacrificaremus Jehovae Deo nostro. Ecce, si sacrificaremus abominationem Aegyptiorum coram oculos eorum, annon lapidarent nos?

27. We will go three days' journey into the wilderness, and sacrifice to the Lord our God, as he shall command us.

27. Viam trium dierum progrediemur in desertum, et sacrificabimus Jehovae Deo nostro, quemadmodum praecepit nobis.

20. And the Lord said unto Moses, Rise up early. As Pharaoh advances in daring rashness, so does God on the other hand proceed to restrain his impetuosity by opposing impediments. This is what the wicked at length obtain by long and multiplied contention, that having received many wounds they perish by various torments. With respect to the command that Moses should meet Pharaoh, when he shall go down in the morning to the river-side for his pleasure, it is uncertain whether God would have the tyrant encountered in public, because the palace was difficult of access; although it seems probable to me, that a place was chosen in which the proceeding would be more manifest, and where the voice of His messenger would be more clearly heard. Therefore, that nothing might be done secretly, Moses proclaims in open day, before the whole multitude, that judgment of God, which immediately afterwards took effect. But here no mention is made of the rod, as in the former plagues; because God sometimes makes use of external instruments, that we may know that all creatures are in His hand, and are wielded according to His will; but sometimes acts independently of them, that we may know that He needs no such assistance. This varied mode of action demonstrates that He subjects all things to His empire as He pleases, and yet that He is contented with His own power. This plague has some affinity to the two previous ones, inasmuch as its infliction is attended with ignominy, which may put the tyrant to shame. The Hebrew word rv, [95] gnarob, means the same as the Latin "examen insectorum," a swarm of insects. Many interpreters think that there was a mixture of various kinds; and this I do not reject, since it is probable that their foul odour was multiplied, so as almost to suffocate the tyrant. Those who explain it as describing bears, lions, tigers, wolves, and other wild beasts, depart without any reason from the genuine meaning of the word.

22. And I will sever. Although this had not been expressly declared as yet, still it must be extended to the other plagues; for it is certain, that when God inflicted punishment on the Egyptians, He did not proceed promiscuously against all men; and, therefore, that His chosen people, in whose behalf He acted, were free from all inconvenience. But now perhaps for the first time this distinction is made more evident to Pharaoh, whereas before the peculiar grace of God had not been known to him. From hence, however, it was more than plain, that mercies and punishments were in the power of the one God of Israel, so that He might spare His own people, and treat them kindly and paternally, whilst, on the other hand, He exercised vengeance against His enemies. Wherefore He adds, "to the end thou mayest know that I am the Lord God in the midst of the earth." There is all implied antithesis here, which casts down all idols, and exalts the God of Israel alone. But although "the earth" may be here taken for the whole habitable globe, it will be properly confined to Egypt, as if God affirmed that He was supreme in the midst of Egypt, or everywhere throughout all Egypt, which means the same. The expression which follows, although somewhat harsh, yet contains no ambiguity. God is said to have "put a redemption between his people and the Egyptians; [96] because, as if He had erected barriers, or set up a fence to preserve one corner in safety, He had withholden His favor from the whole surrounding district. Moreover, because the word phlh, [97] phelo, signifies to be admirable, or to be concealed, some interpreters translate it, "I will render admirable [98] the land of Goshen;" but I have preferred following the more usual rendering which appears to be most appropriate. Lastly, it is to be observed that time for repentance is again given to Pharaoh, so that, if he were curable, he might prevent the punishment denounced against him: for God might have sent the insects at the moment; but He assigns the morrow, to prove the wickedness of the tyrant.

25. And Pharaoh called for Moses. Pharaoh imagines that he is granting a great thing, if the Israelites are permitted to offer sacrifice to God in Egypt. He and all his people should have humbly embraced the worship of God, and casting away their superstitions should have sought to Moses as their instructor in sincere piety. He departs from none of their common vices; he does not renounce his idols nor forsake his former errors; but only permits God to be worshipped in one part of his kingdom. But this is customary with the reprobate, to think that they have sufficiently done their duty, when they yield ever so little to God. Hence it arises, that when they are conquered and compelled, still they would not hesitate to detract somewhat from the rights of God; nay, if they might do so with impunity, they would willingly rob Him of all. And in fact as long as fortune [99] is propitious, and they enjoy a state of prosperity and safety, they deprive God, as much as may be, of all His glory; but when the power of resisting fails them, they so descend to submission as to defraud Him of half His due honor. God had commanded a free departure to be conceded to His people; Pharaoh does not obey this command, but endeavors to satisfy God in another way, viz., by not forbidding them to offer sacrifice in Egypt. This sin, which was common in all ages, is now-a-days too clearly manifest. Our Pharaohs would altogether extinguish God's glory, and this they madly set themselves to compass; but when reduced to extremities, if there be no further use in professedly contending with Him, they maim and mutilate His worship by a fictitious course, which they call a reformation. Hence arose that mixture of light and darkness, which was named "the Interim" [100] Nor do the enemies of the truth cease to obtrude thus ridiculously upon God their empty and unreal expiation's.

26. And Moses said. The word kvn, [101] kon, which Moses here uses, has a wide signification; for the Hebrews say of whatever they do not approve, that it is not right (rectum.) Therefore almost all the interpreters agree in this, that Pharaoh demanded what was by no means equitable, because he would have exposed the Israelites to be stoned by his people. If this opinion be admitted, we must read the passage connectedly, that it was not in accordance with reason, that the Israelites should sacrifice in Egypt in a strange manner, because the novelty would not be tolerated. There are two clauses in the sentence; one, that it was not right for them to offer in Egypt a sacrifice to God, which was abominable to the inhabitants themselves, or to offer a profane sacrifice of the abominations of the heathen; the other, that there was a danger of the Israelites being stoned, if they provoked the Egyptians by a ceremony, which was detestable to them. As to the second clause, there is no doubt that "the abomination of the Egyptians" is taken actively for the sacrifices which they abominate. The same seems to be the meaning of the first clause; for it would be harsh to interpret the same forms of expression differently within a few words of each other; except that the name of Jehovah, put in opposition as it is to "the abomination," seems to require a passive signification. For Moses says emphatically, that "it is not right to sacrifice the abomination of Egypt to Jehovah the God of Israel." If this view be adopted, "the abomination" will be the profanation of true and pure worship, wherewith the sacred ceremonies of the Egyptians were defiled; as much as to say, that it was unlawful to mix up the worship of the true God with such sacrilege. And, in fact, Moses seems to contend with a twofold argument; first, that it was not right, secondly, that it was not expedient. Take this, then, as the first reason, that a sacrifice which should. be polluted by the abominations of Egypt, would neither be lawful nor pleasing to God; the second will follow after, that the Egyptians would not tolerate it; because they would conceive both themselves and their gods to be grievously insulted, if their accustomed mode of sacrificing should be violated. This interpretation is fuller, and contains fuller doctrine, if Moses, first of all, was solicitous as to the honor of God, and did not regard the advantage of the people only; and in this sentiment, that the true God could not be duly worshipped unless when separated from all idols, there is nothing forced. But, since in the same verse "the abomination of the Egyptians" is taken actively, it will be well, in order that the construction may be more easy, to expound it thus in both places. Then the sense of the first clause will be, it is not consistent to expose the worship of our God to the reproaches and sneers of the Gentiles; which would be the case, if the Egyptians should see us honoring a sacrificial ceremony which they abominate. I do not, indeed, assent to their opinion, who will not admit the passage to consist of two clauses, but read it connectedly thus -- that it was not right to do this, because the Egyptians would stone the Israelites. For Moses not only had regard to what was best for the people, but primarily to what would please God, viz., that His holy name should not be profaned. I see no foundation in reason for restraining, as is usually done, the word "abomination" to the animals of sacrifice; and, therefore, I extend it to the whole operation of sacrificing. [102]

27. We will go three days' journey. This is the conclusion that no change must be made in God's command, but that His injunction must be obeyed simply, and without exception. Nor is there little praise due to the firmness of Moses, who so boldly and unreservedly rejected the pretended moderation of the tyrant, because it would have somewhat interfered with the will of God. He therefore declares that the Israelites would do no otherwise than as God had prescribed.

Footnotes:

[95] The root rv, means commingling, and the producing of confusion thereby. Hence evening is called rv, from the mingling together of day and night; and the same name is given to a mixed crowd; and possibly to a confused swarm of insects. The LXX. have taken it for the name of some particular kind of fly in this instance; whilst S M. has mentioned certain Rabbies, as affirming that it here means a mingled crowd of wild beasts. -- W

[96] Verse 23, "And I will put a division," marg., "redemption." -- A.V.

[97] phlh, is to separate, to distinguish by marks of favor, phl', to be wonderful, or inscrutable The derivatives from these kindred roots are, however, not always.distinguishable; and in this instance S M. and the V. have rendered hphlyty, as C. mentions, assuming it to be irregularly formed from phl'. -- W

[98] French, "miraculeuse."

[99] Ils ont vent en pouppe, -- Fr.

[100] The document called the Interim, drawn up at the suggestion of Charles V., and published at the Diet of Augsburg in 1548, was professedly a measure of mutual concession, prescribing what was to be believed in the interim, "until all could be established by a general council." In reality, however, it was opposed to the Reformation on all the main points of dispute; and conceded nothing but that married priests should retain their cures, and that, where the cup had been again given to the laity, it might be continued. It is printed at length in Osiander, Ecc. Hist., cent. 16, lib. 2 Corinthians 72; and a copious summary of its contents is given by F1eury, 54:145. See Robertson's Charles V., and Stokes's continuation of Milner. See also Calvin's Tracts, Calv. Soc., vol. 3, on the Adultero-German Interim.

[101] C. adopts the translation of S. M., instead of that found in the V., and gives his readers the short note of S.M., "Non convenit, sive non est rectum." -- W.

[102] "For the Egyptians worshipped divers beasts, as the ox, the sheep, and such like, which the Israelites offered in sacrifice; which things the Egyptians abhorred to see." -- Geneva Version, in loco.

And sacrifice to the Lord - as he shall command us - It is very likely that neither Moses nor Aaron knew as yet in what manner God would be worshipped; and they expected to receive a direct revelation from him relative to this subject, when they should come into the wilderness.

We will go three days' journey into the wilderness,.... As was first insisted on, and from which demand they should not depart:

and sacrifice unto the Lord our God, as he shall command us; both what sacrifices shall be offered, and the manner in which they shall be done, both which seemed for the present in a good measure undetermined and unknown; and therefore it was possible, and very probable, that in one or the other they should give offence to the Egyptians, should they sacrifice among them, being at all events resolved to do as the Lord should command them.

For we know not what kind or number of sacrifices to offer to him till we come thither.

As the Egyptian magicians saw nothing more than the finger of God in the miracle which they could not imitate, that is to say, the work of some deity, possibly one of the gods of the Egyptians, and not the hand of Jehovah the God of the Hebrews, who had demanded the release of Israel, a distinction was made in the plagues which followed between the Israelites and the Egyptians, and the former were exempted from the plagues: a fact which was sufficient to prove to any one that they came from the God of Israel. To make this the more obvious, the fourth and fifth plagues were merely announced by Moses to the king. They were not brought on through the mediation of either himself or Aaron, but were sent by Jehovah at the appointed time; no doubt for the simple purpose of precluding the king and his wise men from the excuse which unbelief might still suggest, viz., that they were produced by the powerful incantations of Moses and Aaron.
Exo 8:20-22
The fourth plague, the coming of which Moses foretold to Pharaoh, like the first, in the morning, and by the water (on the bank of the Nile), consisted in the sending of "heavy vermin," probably Dog-Flies. ערב, literally a mixture, is rendered κυνόμυια (dog-fly) by the lxx, πάμμυια (all-fly), a mixture of all kinds of flies, by Symmachus. These insects are described by Philo and many travellers as a very severe scourge (vid., Hengstenberg ut sup. p. 113). They are much more numerous and annoying than the gnats; and when enraged, they fasten themselves upon the human body, especially upon the edges of the eyelids, and become a dreadful plague. כּבד: a heavy multitude, as in Exo 10:14; Gen 50:9, etc. These swarms were to fill "the houses of the Egyptians, and even the land upon which they (the Egyptians) were," i.e., that part of the land which was not occupied by houses; whilst the land of Goshen, where the Israelites dwelt, would be entirely spared. הפלה (to separate, to distinguish in a miraculous way) is conjugated with an accusative, as in Psa 4:4. It is generally followed by בּין (Exo 4:4; Exo 11:7), to distinguish between. עמד: to stand upon a land, i.e., to inhabit, possess it; not to exist, or live (Exo 21:21).
Exo 8:23
"And I will put a deliverance between My people and thy people." פּדוּת does not mean διαστολή, divisio (lxx, Vulg.), but redemption, deliverance. Exemption from this plague was essentially a deliverance for Israel, which manifested the distinction conferred upon Israel above the Egyptians. By this plague, in which a separation and deliverance was established between the people of God and the Egyptians, Pharaoh was to be taught that the God who sent this plague was not some deity of Egypt, but "Jehovah in the midst of the land" (of Egypt); i.e., as Knobel correctly interprets it, (a) that Israel's God was the author of the plague; (b) that He had also authority over Egypt; and (c) that He possessed supreme authority: or, to express it still more concisely, that Israel's God was the Absolute God, who ruled both in and over Egypt with free and boundless omnipotence.
Exo 8:24-27
This plague, by which the land was destroyed (תּשּׁחת), or desolated, inasmuch as the flies not only tortured, "devoured" (Psa 78:45) the men, and disfigured them by the swellings produced by their sting, but also killed the plants in which they deposited their eggs, so alarmed Pharaoh that he sent for Moses and Aaron, and gave them permission to sacrifice to their God "in the land." But Moses could not consent to this restriction. "It is not appointed so to do" (נכון does not mean aptum, conveniens, but statutum, rectum), for two reasons: (1) because sacrificing in the land would be an abomination to the Egyptians, and would provoke them most bitterly (Exo 8:26); and (2) because they could only sacrifice to Jehovah their God as He had directed them (Exo 8:27). The abomination referred to did not consist in their sacrificing animals which the Egyptians regarded as holy. For the word תּועבה (abomination) would not be applicable to the sacred animals. Moreover, the cow was the only animal offered in sacrifice by the Israelites, which the Egyptians regarded as sacred. The abomination would rather be this, that the Iran would not carry out the rigid regulations observed by the Egyptians with regard to the cleanness of the sacrificial animals (vid., Hengstenberg, p. 114), and in fact would not observe the sacrificial rites of the Egyptians at all. The Egyptians would be very likely to look upon this as an insult to their religion and their gods; "the violation of the recognised mode of sacrificing would be regarded as a manifestation of contempt for themselves and their gods" (Calvin), and this would so enrage them that they would stone the Israelites. The הן before נזבּח in Exo 8:26 is the interjection lo! but it stands before a conditional clause, introduced without a conditional particle, in the sense of if, which it has retained in the Chaldee, and in which it is used here and there in the Hebrew (e.g., Lev 25:20).
Exo 8:28-32
These reasons commended themselves to the heathen king from his own religious standpoint. He promised, therefore, to let the people go into the wilderness and sacrifice, provided they did not go far away, if Moses and Aaron would release him and his people from this plague through their intercession. Moses promised that the swarms should be removed the following day, but told the king not to deceive them again as he had done before (Exo 8:8). But Pharaoh hardened his heart as soon as the plague was taken away, just as he had done after the second plague (Exo 8:15), to which the word "also" refers (Exo 8:32).