Leviticus 20:18

18 "'If a man has sexual relations with a woman during her monthly period, both the woman and the man must be cut off from their people. They sinned because they showed the source of her blood.

Leviticus 20:18 Meaning and Commentary

Leviticus 20:18

And if a man shall lie with a woman having her sickness
Her monthly courses, which make her weak and languid, which is forbidden, ( Leviticus 18:19 ) ; this is not to be understood of a man's lying with his wife ignorantly, when in such a condition, for this being the case, he was only unclean seven days, ( Leviticus 15:24 ) ; whereas this made him and her liable to cutting off, as in an after clause; but of his lying with her, knowing this to be the case with her, and of which she could not be ignorant, and therefore both liable to the same punishment; or else of any other man lying with her, or of any man lying with any woman, married or unmarried, being in such circumstances: and shall uncover her nakedness;
that is, have carnal knowledge of her: he hath discovered her fountain;
from whence her issue of blood flows: and she hath uncovered the fountain of her blood; freely and willingly, as Aben Ezra observes; for if she had been forced, he alone would have been cut off; but both these phrases put together show agreement in this matter, that they both had knowledge of her case, and both consented to commit the sin: and both of them shall be cut off from among their people;
by death, either by the hand of the civil magistrate, the case being known and proved, or else by the hand of God being known by mortality or the pestilence, as the Targum of Jonathan, or they should die childless; (See Gill on Leviticus 20:17).

Leviticus 20:18 In-Context

16 If a woman approaches an animal and has sexual relations with it, you must kill the woman and the animal. They must be put to death. They have brought it on themselves.

17 "'It is shameful for a brother to marry his sister, the daughter of either his father or his mother, and to have sexual relations with her. In front of everyone they must both be cut off from their people. The man has shamed his sister, and he is guilty of sin.

18 "'If a man has sexual relations with a woman during her monthly period, both the woman and the man must be cut off from their people. They sinned because they showed the source of her blood.

19 "'Do not have sexual relations with your mother's sister or your father's sister, because that would shame a close relative. Both of you are guilty of this sin.

20 "'If a man has sexual relations with his uncle's wife, he has shamed his uncle. That man and his uncle's wife will die without children; they are guilty of sin.