Leviticus 18:4-6

New Catholic Bible

⁴ You shall observe my statutes, and you shall keep my ordinances, walking in them. I am the Lord, your God. ⁵ You shall keep my ordinances and my statutes. He who obeys them shall live by them. I am the Lord, your God.

⁶ “ ‘None of you is to be intimate with any of your close relatives, to uncover their nakedness. I am the Lord.