Leviticus 18:7-9

New Century Version

⁷ “‘You must not shame your father by having sexual relations with your mother. She is your mother; do not have sexual relations with her. ⁸ You must not have sexual relations with your father’s wife; that would shame your father.

⁹ “‘You must not have sexual relations with your sister, either the daughter of your father or your mother. It doesn’t matter if she was born in your house or somewhere else.