John Gills Exposition of the Bible 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... read more
Matthew Henry's Complete Commentary - Leviticus 20:10-21
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. The adulterer and the adulteress that had joined in the sin must fall alike under the sentence: they shall both be put to death, Lev. 20:10. Long before... read more