Leviticus 18:7-9

American Standard Version

⁷ The nakedness of thy father, even the nakedness of thy mother, shalt thou not uncover: she is thy mother; thou shalt not uncover her nakedness. ⁸ The nakedness of thy father’s wife shalt thou not uncover; it is thy father’s nakedness. ⁹ The nakedness of thy sister, the daughter of thy father, or the daughter of thy mother, whether born at home, or born abroad, even their nakedness thou shalt not uncover.