Leviticus 18:24-30

24“Do not make yourselves unclean by any of these things, for by all these the nations I am driving out before you have become unclean, 25and the land became unclean, so that I punished its iniquity, and the land vomited out its inhabitants. 26But you shall keep my statutes and my rules and do none of these abominations, either the native or the stranger who sojourns among you 27(for the people of the land, who were before you, did all of these abominations, so that the land became unclean), 28lest the land vomit you out when you make it unclean, as it vomited out the nation that was before you. 29For everyone who does any of these abominations, the persons who do them shall be cut off from among their people. 30So keep my charge never to practice any of these abominable customs that were practiced before you, and never to make yourselves unclean by them: I am the LORD your God.”