Exodus 20:14

Thou shall not commit adultery, Which, strictly speaking, is only that sin which is committed with another man's wife, as Jarchi observes; but Aben Ezra thinks the word here used signifies the same as another more commonly used for whoredom and fornication; and no doubt but fornication is here included, which, though it was not reckoned a crime among some Heathens, is within the reach of this law, and forbidden by it, it being an impure action, and against a man's body, as the apostle says, 1 Corinthians 6:18 as well as sins of a more enormous kind, as unnatural lusts and copulations, such as incest, sodomy, bestiality, &c.; and even all unchaste thoughts, desires, and affections, obscene words, and impure motions and gestures of the body, and whatever is in itself unclean or tends to uncleanness; as it also requires that we should, as much as in us lies, do all we can to preserve our chastity, and the chastity of others, pure and inviolate, see Matthew 5:28 , this is the seventh commandment.