Leviticus 18:3, 24, 30

After the doings of the land of Egypt, wherein ye dwelt, shall ye not do: and after the doings of the land of Canaan, whither I bring you, shall ye not do; neither shall ye walk in their statutes.

Defile not ye yourselves in any of these things: for in all these the nations are defiled which I cast out from before you

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.