Leviticus 18:6-10

⁶No one must sleep with any close relative to uncover his nakedness. I am Yahweh.

⁷Do not dishonor your father by sleeping with your mother. She is your mother! You must not dishonor her.

⁸Do not sleep with any of your father's wives; you must not dishonor your father like that.

⁹Do not sleep with any sister of yours, whether she is the daughter of your father or the daughter of your mother, whether she was raised at your home or distant from you. You must not sleep with your sisters.

¹⁰Do not sleep with your son's daughter or with your daughter's daughter. That would be your own shame.