Leviticus 18:9-11

The Voice

⁹ You are not to have sexual relations with your sister—whether she is your father’s daughter or mother’s daughter, regardless of where she has lived, with your family or elsewhere. ¹⁰ Do not have sexual relations with your son’s daughter or your daughter’s daughter; since they are your own flesh and blood, such an act would bring shame to you. ¹¹ You are not to have sexual relations with your stepsister, the daughter of your father and his wife;^[a] for she is still your sister.