Leviticus 18:3, 24, 30

You shall not do as they do in the land of Egypt, where you lived, and you shall not do as they do in the land of Canaan, to which I am bringing you. You shall not walk in their statutes.

“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

So 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.”