Leviticus 20:18

18 If a man sleeps with a woman during her menstrual period and has sexual contact with her, he has exposed the source of her blood flow and she has uncovered the same. Both of them will be cut off from their people.

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 any kind of animal to mate with it, you must kill the woman and the animal. They must be executed; their blood is on their own heads.

17 If a man marries his sister—his father's daughter or his mother's daughter—and they have sexual contact with each other, it is a disgrace. They will be cut off in the sight of their people. Such a man has had sexual contact with his sister; he will be liable to punishment.

18 If a man sleeps with a woman during her menstrual period and has sexual contact with her, he has exposed the source of her blood flow and she has uncovered the same. Both of them will be cut off from their people.

19 You must not have sexual contact with your mother's sister or your father's sister, because that exposes your own close relative; both of you will be liable to punishment.

20 If a man has sexual intercourse with his aunt, he has uncovered his uncle's nakedness. The man and the aunt will be liable to punishment; they will die childless.