Leviticus 18:24-30

Defile not ye yourselves in any of these things: for in all these the nations are defiled which I cast out from before you; and the land is defiled: therefore I do visit the iniquity thereof upon it, and the land vomiteth out her inhabitants. Ye therefore shall keep my statutes and mine ordinances, and shall not do any of these abominations; neither the home-born, nor the stranger that sojourneth among you (for all these abominations have the men of the land done, that were before you, and the land is defiled); that the land vomit not you out also, when ye defile it, as it vomited out the nation that was before you. For whosoever shall do any of these abominations, even the souls that do them shall be cut off from among their people. Therefore shall ye keep my charge, that ye practise not any of these abominable customs, which were practised before you, and that ye defile not yourselves therein: I am Jehovah your God.