If a man lies with a menstruating woman and has sexual relations with her, he has exposed the source of her flow, and she has uncovered the source of her blood. Both of them must be cut off from among their people.
Leviticus 20:18. And if a man shall lie This passage considered further on in Fr., under the head of “Political Supplements.” The enormity of the crime is seen by the severity of the punishment; and surely, when a man and woman abandon themselves to so disgraceful an act, it is plain that there are no remains of modesty in them.
Sins against the seventh commandment are here ordered to be severely punished. These are sins which, of all others, fools are most apt to make a mock at; but God would teach those the heinousness of the guilt by the extremity of the punishment that would not otherwise be taught it. I. Lying with another man's wife was made a capital crime.
Commenting on Leviticus 20:10-21
And if a man shall lie with a woman having her sickness,.... Her monthly courses, which make her weak and languid, which is forbidden, Lev 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, Lev 15:24; whereas this made him and her liable...