Leviticus 18:1–7
1 And the Lord said to Moses, 2 “Say to the people of Israel, I am the Lord your God. 3 You shall not do as they do in the land of Egypt, where you dwelt, 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. 4 You shall do my ordinances and keep my statutes and walk in them. I am the Lord your God. 5 You shall therefore keep my statutes and my ordinances, by doing which a man shall live: I am the Lord.
6 “None of you shall approach any one near of kin to him to uncover nakedness. I am the Lord. 7 You shall not uncover the nakedness of your father, which is the nakedness of your mother; she is your mother, you shall not uncover her nakedness.