Leviticus 18:3, 24, 30
Leviticus 18:24 ESV
“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
Leviticus 18:30 ESV
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.”