Leviticus 18:9-11

Revised Standard Version

⁹ You shall not uncover the nakedness of your sister, the daughter of your father or the daughter of your mother, whether born at home or born abroad. ¹⁰ You shall not uncover the nakedness of your son’s daughter or of your daughter’s daughter, for their nakedness is your own nakedness. ¹¹ You shall not uncover the nakedness of your father’s wife’s daughter, begotten by your father, since she is your sister.