Leviticus 18:9-11

New Revised Standard Version, Anglicised Catholic Edition

⁹ You shall not uncover the nakedness of your sister, your father’s daughter or your mother’s daughter, 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.