Genesis 6:21

But with thee will I establish my covenant--a special promise of deliverance, called a covenant, to convince him of the confidence to be reposed in it. The substance and terms of this covenant are related at Gen 6:19-21.

Here it appears indeed that Noah found grace in the eyes of the Lord. God's favour to him was plainly intimated in what he said of him, Gen 6:8-10, where his name is mentioned five times in five lines, when once might have served to make the sense clear, as if the Holy Ghost took a pleasure in perpetuating his memory; but it appears much more in what he says to him in these verses - the informations and instructions here given him.
I. God here makes Noah the man of his counsel, communicating to him his purpose to destroy this wicked world by water. As, afterwards, he told Abraham his resolution concerning Sodom (Gen 18:17, Shall I hide from Abraham?) so here "Shall I hide from Noah the thing that I do, seeing that he shall become a great nation?" Note, The secret of the Lord is with those that fear him (Psa 25:14); it was with his servants the prophets (Amo 3:7), by a spirit of revelation, informing them particularly of his purposes; it is with all believers by a spirit of wisdom and faith, enabling them to understand and apply the general declarations of the written word, and the warnings there given. Now,
1. God told Noah, in general, that he would destroy the world (Gen 6:13): The end of all flesh has come before me; I will destroy them; that is, the ruin of this wicked world is decreed and determined; it has come, that is, it will come surely, and come quickly. Noah, it is likely, in preaching to his neighbours, had warned them, in general, of the wrath of God that they would bring upon themselves by their wickedness, and now God seconds his endeavours by a particular denunciation of wrath, that Noah might try whether this would work upon them. Hence observe, (1.) That God confirmeth the words of his messengers, Isa 44:26. (2.) That to him that has, and uses what he has for the good of others, more shall be given, more full instructions.
2. He told him, particularly, that he would destroy the world by a flood of waters: And behold, I, even I, do bring a flood of waters upon the earth, Gen 6:17. God could have destroyed all mankind by the sword of an angel, a flaming sword turning every way, as he destroyed all the first-born of the Egyptians and the camp of the Assyrians; and then there needed no more than to set a mark upon Noah and his family for their preservation. But God chose to do it by a flood of waters, which should drown the world. The reasons, we may be sure, were wise and just, though to us unknown. God has many arrows in his quiver, and he may use which he please: as he chooses the rod with which he will correct his children, so he chooses the sword with which he will cut off his enemies. Observe the manner of expression: "I, even I, do bring a flood; I that am infinite in power, and therefore can do it, infinite in justice, and therefore will do it." (1.) It intimates the certainty of the judgment: I, even I, will do it. That cannot but be done effectually which God himself undertakes the doing of. See Job 11:10. (2.) It intimates the tendency of it to God's glory and the honour of his justice. Thus he will be magnified and exalted in the earth, and all the world shall be made to know that he is the God to whom vengeance belongs; methinks the expression here is somewhat like that, Isa 1:24, Ah, I will ease me of mine adversaries.
II. God here makes Noah the man of his covenant, another Hebrew periphrasis of a friend (Gen 6:18): But with thee will I establish my covenant. 1. The covenant of providence, that the course of nature shall be continued to the end of time, notwithstanding the interruption which the flood would give to it. This promise was immediately made to Noah and his sons, Gen 9:8, etc. They were as trustees for all this part of the creation, and a great honour was thereby put upon him and his. 2. The covenant of grace, that God would be to him a God and that out of his seed God would take to himself a people. Note, (1.) When God makes a covenant, he establishes it, he makes it sure, he makes it good; his are everlasting covenants. (2.) The covenant of grace has in it the recompence of singular services, and the fountain and foundation of all distinguishing favours; we need desire no more, either to make up our losses for God or to make up a happiness for us in God, than to have his covenant established with us.
III. God here makes Noah a monument of sparing mercy, by putting him in a way to secure himself in the approaching deluge, that he might not perish with the rest of the world: I will destroy them, says God, with the earth, Gen 6:13. "But make thee an ark; I will take care to preserve thee alive." Note, Singular piety shall be recompensed with distinguishing salvations, which are in a special manner obliging. This will add much to the honour and happiness of glorified saints, that they shall be saved when the greatest part of the world is left to perish. Now,
1. God directs Noah to make an ark, Gen 6:14-15. This ark was like the hulk of a ship, fitted not to sail upon the waters (there was no occasion for that, when there should be no shore to sail to), but to float upon the waters, waiting for their fall. God could have secured Noah by the ministration of angels, without putting him to any care, or pains, or trouble, himself; but he chose to employ him in making that which was to be the means of his preservation, both for the trial of his faith and obedience and to teach us that none shall be saved by Christ but those only that work out their salvation. We cannot do it without God, and he will not without us. Both the providence of God, and the grace of God, own and crown the endeavours of the obedient and diligent. God gave him very particular instructions concerning this building, which could not but be admirably well fitted for the purpose when Infinite Wisdom itself was the architect. (1.) It must be made of gopher-wood. Noah, doubtless, knew what sort of wood that was, though we now do not, whether cedar, or cypress, or what other. (2.) He must make it three stories high within. (3.) He must divide it into cabins, with partitions, places fitted for the several sorts of creatures, so as to lose no room. (4.) Exact dimensions were given him, that he might make it proportionable, and might have room enough in it to answer the intention and no more. Note, Those that work for God must take their measures from him and carefully observe them. Note, further, It is fit that he who appoints us our habitation should fix the bounds and limits of it. (5.) He must pitch it within and without - without, to shed off the rain, and to prevent the water from soaking in - within, to take away the bad smell of the beasts when kept close. Observe, God does not bid him paint it, but pitch it. If God gives us habitations that are safe, and warm, and wholesome, we are bound to be thankful, though they are not magnificent or nice. (6.) He must make a little window towards the top, to let in light, and (some think) that through that window he might behold the desolations to be made in the earth. (7.) He must make a door in the side of it, by which to go in and out.
2. God promises Noah that he and his shall be preserved alive in the ark (Gen 6:18): Thou shalt come into the ark. Note, What we do in obedience to God, we ourselves are likely to have the comfort and benefit of. If thou be wise, thou shalt be wise for thyself. Nor was he himself only saved in the ark, but his wife, and his sons, and his sons' wives. Observe, (1.) The care of good parents; they are solicitous not only for their own salvation, but for the salvation of their families, and especially their children. (2.) The happiness of those children that have godly parents. Their parents' piety often procures them temporal salvation, as here; and it furthers them in the way to eternal salvation, if they improve the benefit of it.
IV. God here makes Noah a great blessing to the world, and herein makes him an eminent type of the Messiah, though not the Messiah himself, as his parents expected, Gen 5:29. 1. God made him a preacher to the men of that generation. As a watchman, he received the word from God's mouth, that he might give them warning, Eze 3:17. Thus, while the long-suffering of God waited, by his Spirit in Noah, he preached to the old world, who, when Peter wrote, were spirits in prison (Pe1 3:18-20), and herein he was a type of Christ, who, in a land and age wherein all flesh had corrupted their way, went about preaching repentance and warning men of a deluge of wrath coming. 2. God made him a saviour to the inferior creatures, to keep the several kinds of them from perishing and being lost in the deluge, Gen 6:19-21. This was a great honour put upon him, that not only in him the race of mankind should be kept up, and that from him should proceed a new world, the church, the soul of the world, and Messiah, the head of that church, but that he should be instrumental to preserve the inferior creatures, and so mankind should in him acquire a new title to them and their service. (1.) He was to provide shelter for them, that they might not be drowned. Two of every sort, male and female, he must take with him into the ark; and lest he should make any difficulty of gathering them together, and getting them in, God promises (Gen 6:20) that they shall of their own accord come to him. He that makes the ox to know his owner and his crib then made him know his preserver and his ark. (2.) He was to provide sustenance for them, that they might not be starved, Gen 6:21. He must victual his ship according to the number of his crew, that great family which he had now the charge of, and according to the time appointed for his confinement. Herein also he was a type of Christ, to whom it is owing that the world stands, by whom all things consist, and who preserves mankind from being totally cut off and ruined by sin; in him the holy seed is saved alive, and the creation rescued from the vanity under which it groans. Noah saved those whom he was to rule, so does Christ, Heb 5:9.

And of every living thing of all flesh. "All flesh" is the name he gives to animals of whatsoever kind they may be. He says they went in two and two; not that a single pair of each kind was received into the ark, (for we shall soon see that there were three pairs of the clean kinds, and one animal over, which Noah afterwards offered in sacrifice;) but whereas here mention is made only of offspring, he does not expressly state the number, but simply couples males with females, that Noah might hence perceive how the world was to be replenished.

Of all food that is eaten - That is, of the food proper for every species of animals.

And take thou unto thee of all food that is eaten,.... By man and beast; of which see Genesis 1:29.

and thou shall gather it to thee; to lay up in the ark:

and it shall be for food for thee, and for them: during the flood, a quantity sufficient for them: and according to the calculation of learned men (n), well versed in mathematics, there was room enough in the ark, and to spare, to put food for them all during the time the flood was on the earth.

(n) Buteo de Area Noe, Wilkins's Essay towards a real Character, Bedford's Chronology, &c.

See .

Gen 6:9-12 contain a description of Noah and his contemporaries; Gen 6:13-22, the announcement of the purpose of God with reference to the flood.
Gen 6:9
"Noah, a righteous man, was blameless among his generations:" righteous in his moral relation to God; blameless (τέλειος, integer) in his character and conduct. דּרות, γενεαί, were the generations or families "which passed by Noah, the Nestor of his time." His righteousness and integrity were manifested in his walking with God, in which he resembled Enoch (Gen 5:22).
Gen 6:10-12
In Gen 6:10-12, the account of the birth of his three sons, and of the corruption of all flesh, is repeated. This corruption is represented as corrupting the whole earth and filling it with wickedness; and thus the judgment of the flood is for the first time fully accounted for. "The earth was corrupt before God (Elohim points back to the previous Elohim in Gen 6:9)," it became so conspicuous to God, that He could not refrain from punishment. The corruption proceeded from the fact, that "all flesh" - i.e., the whole human race which had resisted the influence of the Spirit of God and become flesh (see Gen 6:3) - "had corrupted its way." The term "flesh" in Gen 6:12 cannot include the animal world, since the expression, "corrupted its way," is applicable to man alone. The fact that in Gen 6:13 and Gen 6:17 this term embraces both men and animals is no proof to the contrary, for the simple reason, that in Gen 6:19 "all flesh" denotes the animal world only, an evident proof that the precise meaning of the word must always be determined from the context.
Gen 6:13
"The end of all flesh is come before Me." אל בּוא, when applied to rumours, invariably signifies "to reach the ear" (vid., Gen 18:21; Exo 3:9; Est 9:11); hence לפני בּא in this case cannot mean a me constitutus est (Ges.). קץ, therefore, is not the end in the sense of destruction, but the end (extremity) of depravity or corruption, which leads to destruction. "For the earth has become full of wickedness מפּגיהם," i.e., proceeding from them, "and I destroy them along with the earth." Because all flesh had destroyed its way, it should be destroyed with the earth by God. The lex talionis is obvious here.
Gen 6:14-15
Noah was exempted from the extermination. He was to build an ark, in order that he himself, his family, and the animals might be preserved. תּבה, which is only used here and in Exo 2:3, Exo 2:5, where it is applied to the ark in which Moses was placed, is probably an Egyptian word: the lxx render it κίβωτος here, and θίβη in Exodus; the Vulgate arca, from which our word ark is derived. Gopher-wood (ligna bituminata; Jerome) is most likely cypress. The ἁπ. λεγ. gopher is related to כּפר, resin, and κυπάρισσος; it is no proof to the contrary that in later Hebrew the cypress is called berosh, for gopher belongs to the pre-Hebraic times. The ark was to be made cells, i.e., divided into cells, קנּים (lit., nests, niduli, mansiunculae), and pitched (כּפר denom. from כּפר) within and without with copher, or asphalte (lxx ἄσφαλτος, Vulg. bitumen). On the supposition, which is a very probable one, that the ark was built in the form not of a ship, but of a chest, with flat bottom, like a floating house, as it was not meant for sailing, but merely to float upon the water, the dimensions, 300 cubits long, 50 broad, and 30 high, give a superficial area of 15,000 square cubits, and a cubic measurement of 450,000 cubits, probably to the ordinary standard, "after the elbow of a man" (Deu 3:11), i.e., measured from the elbow to the end of the middle finger.
Gen 6:16
"Light shalt thou make to the ark, and in a cubit from above shalt thou finish it." As the meaning light for צהר is established by the word צהרים, "double-light" or mid-day, the passage can only signify that a hole or opening for light and air was to be so constructed as to reach within a cubit of the edge of the roof. A window only a cubit square could not possibly be intended; for צהר is not synonymous with חלּון (Gen 8:6), but signifies, generally, a space for light, or by which light could be admitted into the ark, and in which the window, or lattice for opening and shutting, could be fixed; though we can form no distinct idea of what the arrangement was. The door he was to place in the side; and to make "lower, second, and third (sc., cells)," i.e., three distinct stories.
(Note: As the height of the ark was thirty cubits, the three stories of cells can hardly have filled the entire space, since a room ten cubits high, or nine cubits if we deduct the thickness of the floors, would have been a prodigality of space beyond what the necessities required. It has been conjectured that above or below these stories there was space provided for the necessary supplies of food and fodder. At the same time, this is pure conjecture, like every other calculation, not only as to the number and size of the cells, but also as to the number of animals to be collected and the fodder they would require. Hence every objection that has been raised to the suitability of the structure, and the possibility of collecting all the animals in the ark and providing them with food, is based upon arbitrary assumptions, and should be treated as a perfectly groundless fancy. As natural science is still in the dark as to the formation of species, and therefore not in a condition to determine the number of pairs from which all existing species are descended, it is ridiculous to talk, as Pfaff and others do, of 2000 species of mammalia, and 6500 species of birds, which Noah would have had to feed every day.)
Gen 6:17-21
Noah was to build this ark, because God was about to bring a flood upon the earth, and would save him, with his family, and one pair of every kind of animal. מבּוּל, (the flood), is an archaic word, coined expressly for the waters of Noah (Isa 54:9), and is used nowhere else except Psa 29:10. הארץ על מים is in apposition to mabbul: "I bring the flood, waters upon the earth, to destroy all flesh, wherein is a living breath" (i.e., man and beast). With Noah, God made a covenant. On בּרית see Gen 15:18. As not only the human race, but the animal world also was to be preserved through Noah, he was to take with him into the ark his wife, his sons and their wives, and of every living thing, of all flesh, two of every sort, a male and a female, to keep them alive; also all kinds of food for himself and family, and for the sustenance of the beasts.
Gen 6:22
"Thus did Noah, according to all that God commanded him" (with regard to the building of the ark). Cf. Heb 11:7.