Leviticus 18:7-9

New Catholic Bible

⁷ You shall not uncover the nakedness of your father or your mother. She is your mother; you shall not uncover her nakedness. ⁸ You shall not uncover the nakedness of your father’s wife, for her nakedness is like your father’s own nakedness. ⁹ You shall not uncover the nakedness of your sister, whether she be the daughter of your father or the daughter of your mother, whether she be born in your household or elsewhere.