Leviticus 15:18

If a man had a seminal emission during sexual intercourse, both he and the woman became unclean. They had to wash and remain unclean until evening. This was because of a natural bodily emission, not because of infection or disease, and no sacrifice was required.

The idea of normal and abnormal, along with the created order, helps interpret these rules (see “Clean, Unclean, and Holy” Theme Note). Bodily discharges, like infections (see study note on Leviticus 13:1–46), were not considered "normal" because they weakened a person's health. This made the person seem incomplete. Whether male (15:1–18) or female (15:19–33), such a person became unclean.

then he shall number to himself seven days for his cleansing--Like a leprous person he underwent a week's probation, to make sure he was completely healed. Then with the sacrifices prescribed, the priest made an atonement for him, that is, offered the oblations necessary for the removal of his ceremonial defilement, as well as the typical pardon of his sins.

We have here the law concerning the ceremonial uncleanness that was contracted by running issues in men. It is called in the margin (Lev 15:2) the running of the reins: a very grievous and loathsome disease, which was, usually the effect and consequent of wantonness and uncleanness, and a dissolute course of life, filling men's bones with the sins of their youth, and leaving them to mourn at the last, when all the pleasures of their wickedness have vanished, and nothing remains but the pain and anguish of a rotten carcase and a wounded conscience. And what fruit has the sinner then of those things whereof he has so much reason to be ashamed? Rom 6:21. As modesty is an ornament of grace to the head and chains about the neck, so chastity is health to the navel and marrow to the bones; but uncleanness is a wound and dishonour, the consumption of the flesh and the body, and a sin which is often its own punishment more than any other. It was also sometimes inflicted by the righteous hand of God for other sins, as appears by David's imprecation of a curse upon the family of Joab, for the murder of Abner. Sa2 3:29, Let there not fail from the house of Joab one that hath an issue, or is a leper. A vile disease for vile deserts. Now whoever had this disease upon him, 1. He was himself unclean, Lev 15:2. He must not dare to come near the sanctuary, it was at his peril if he did, nor might he eat of the holy things. This signified the filthiness of sin, and of all the productions of our corrupt nature, which render us odious to God's holiness, and utterly unfit for communion with him. Out of a pure heart well kept are the issues of life (Pro 4:23), but out of an unclean heart comes that which is defiling, Mat 12:34, Mat 12:35. 2. He made every person and thing unclean that he touched, or that touched him, Lev 15:4-12. His bed, and his chair, and his saddle, and every thing that belonged to him, could not be touched without a ceremonial uncleanness contracted, which a man must remain conscious to himself of till sunset, and from which he could not be cleansed without washing his clothes, and bathing his flesh in water. This signified the contagion of sin, the danger we are in of being polluted by conversing with those that are polluted, and the need we have with the utmost circumspection to save ourselves from this untoward generation. 3. When he was cured of the disease, yet he could not be cleansed from the pollution without a sacrifice, for which he was to prepare himself by seven days' expectation after he was perfectly clear from his distemper, and by bathing in spring water, Lev 15:13-15. This signified the great gospel duties of faith and repentance, and the great gospel privileges of the application of Christ's blood to our souls for our justification and his grace for our sanctification. God has promised to sprinkle clean water upon us, and to cleanse us from all our filthiness, and has appointed us by repentance to wash and make ourselves clean: he has also provided a sacrifice of atonement, and requires us by faith to interest ourselves in that sacrifice; for it is the blood of Christ his Son that cleanses us from all sin, and by which atonement is made for us, that we may have admission into God's presence and may partake of his favour.

When any man hath a running issue. He here alludes to other species of contamination, for which a solemn purification is required. And, first, he teaches that men are defiled by the flow of the seminal fluid, which occurs in two ways, either when it involuntarily bursts out in sleep, or when it escapes gradually in the disease, which the Greeks call gonor'rhoia This Supplement might, as I have said, be appended to the Seventh Commandment, because every [17] indisposition arising from lust appears here to be condemned; but, if we look more closely, we shall perceive that it is a general law for the cultivation of purity, and which must not be confined to chastity alone. For this flux, arising from disease and debility, unless it be contracted from immoderate venery, has nothing in common with venereal lust. Besides, what is immediately after added concerning the menstruation of women, is connected with other forms of uncleanness and defilement. The sum then is, that the seminal-flux is reckoned among the pollutions which prevented the Israelites from entering the tabernacle, and from the external service of God; and thence the rule must always be borne in mind, that whatever proceeds from an unclean man is corrupt, and that no one can duly offer either himself, or what he possesses, to God, except he who is pure and perfect in soul and body. Thus Paul explains the end and object of this ceremony, when he exhorts believers that, being received as God's peculiar people, they should cleanse themselves

"from all filthiness of the flesh and spirit." (2 Corinthians 7:1.)

But Moses further declares, that uncleanness is contracted, not only when the seed is emitted, but when it is retained; and that not only is the man himself rendered unclean, but whatever he may have touched -- his bed, his seat, his saddle, his clothes; and that the contagion extends to others also, if any should have lain on the same bed, or ridden on the same saddle. Thus did God desire to impress them with horror, that they might be more accustomed to fly from all impurity. Nor would the crime have been detestable: in itself, had not spiritual purity been set forth under this external exercise and symbol. Thus, too, in (Psalm 24:3, 4), the truth of this figure is described:

"Who shall ascend into the hill of the Lord? or who shall stand in His holy place? He that hath clean hands, and a pure heart."

Therefore he who was conscious of no sin in the seminal-flux, still must be reminded by this sign of the corruption of his nature; and at the same time be an example to others, that all should diligently take heed to themselves, because corruption cleaves to the whole human race. In the ablution the remedy of the evil was proposed, since the mark of ignominy induced them to repentance. It is expedient that whosoever is infected with any stain should be brought to shame, so as to be displeased with himself; but the acknowledgment of the evil would produce despair, unless the hope of pardon were associated with it. Therefore, those to whom purification was necessary, are always sent to water; and, whenever water is mentioned, the passage in St. John should be brought to mind, that Christ came "by water and blood," to purge and expiate all uncleanness. (1 John 5:6.) Besides the water, a sacrifice of turtle doves, or two young pigeons is added; and this has reference to the same thing; viz., that purification for the unclean must be sought for elsewhere, which we have at length obtained by the sacrifice of Christ.

They shall both bathe themselves - What a wonderful tendency had these ordinances to prevent all excesses! The pains which such persons must take, the separations which they must observe, and the privations which, in consequence, they must be exposed to in the way of commerce, traffic, etc., would prevent them from making an unlawful use of lawful things.

The woman also with whom man shall lie with seed of copulation,.... It seems to respect any congress of a man and woman, whether in fornication or adultery, or lawful marriage, and particularly the latter; for though marriage is honourable and holy, and carnal copulation in itself lawful, yet such is the sinfulness of nature, that as no act is performed without pollution, so neither that of generation, and by which the corruption of nature is propagated, and therefore required a ceremonial cleansing:

they shall both bathe themselves in water, and be unclean until the even; so Herodotus (f) reports, that as often as a Babylonian man lay with his wife, he had used to sit by consecrated incense, and the woman did the same: and in the morning they were both washed, and did not touch any vessel before they had washed themselves; and he says the Arabians did the like: and the same historian relates (g) of the Egyptians, that they never go into their temples from their wives unwashed; see Exodus 19:15.

(f) Clio, sive, l. 1. c. 198. (g) Euterpe, sive, l. 2. c. 64.

Man, or, the man, to wit, that had such an issue, which is plainly to be understood out, of the whole context. For though in some special cases, relating to the worship of God, men were to forbear the use of the marriage-bed, as ; yet to affirm that the use of it in other cases did generally defile the persons, and make them unclean till even, is contrary to the whole current of Scripture, which affirms the marriage-bed to be undefiled, , to the practice of the Jews, which is a good comment upon their own laws, and to the light of nature and reason.

Sexual connection. "If a man lie with a woman with the emission of seed, both shall be unclean till the evening, and bathe themselves in water." Consequently it was not the concubitus as such which defiled, as many erroneously suppose, but the emission of seed in the coitus. This explains the law and custom, of abstaining from conjugal intercourse during the preparation for acts of divine worship, or the performance of the same (Exo 19:5; Sa1 21:5-6; Sa2 11:4), in which many other nations resembled the Israelites. (For proofs see Leyrer's article in Herzog's Cyclopaedia, and Knobel in loco, though the latter is wrong in supposing that conjugal intercourse itself defiled.)