Leviticus 18:7-9

The Voice

⁷ This includes your father and your mother. You are to honor her as your mother and not have sexual relations with her. ⁸ You are not to have sexual relations with your father’s wife; you might as well violate your father. ⁹ You are not to have sexual relations with your sister—whether she is your father’s daughter or mother’s daughter, regardless of where she has lived, with your family or elsewhere.