Leviticus 18:9-11

9“ ‘Do not have sexual relations with your sister, either your father’s daughter or your mother’s daughter, whether she was born in the same home or elsewhere.

10“ ‘Do not have sexual relations with your son’s daughter or your daughter’s daughter; that would dishonor you.

11“ ‘Do not have sexual relations with the daughter of your father’s wife, born to your father; she is your sister.