Leviticus 18:6-8

New Revised Standard Version, Anglicised Catholic Edition

⁶ None of you shall approach anyone near of kin 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. ⁸ You shall not uncover the nakedness of your father’s wife; it is the nakedness of your father.