Leviticus 18:1-5, 6, 9

GOD spoke to Moses: “Speak to the People of Israel. Tell them, I am GOD, your God. Don’t live like the people of Egypt where you used to live, and don’t live like the people of Canaan where I’m bringing you. Don’t do what they do. Obey my laws and live by my decrees. I am your GOD. Keep my decrees and laws: The person who obeys them lives by them. I am GOD.

“Don’t have sex with a close relative. I am GOD.

“Don’t have sex with your sister, whether she’s your father’s daughter or your mother’s, whether she was born in the same house or elsewhere.