Leviticus 18:6-10

⁶Do not have sex with any of your close relatives. It is I, Yahweh, who am commanding that.

⁷Do not disgrace your father by having sex with your mother DOU.

⁸Do not have sex with any of your father's other wives, because that would disgrace your father.

⁹Do not have sex with your sister or your stepsister; it does not matter whether she was born in your house or somewhere else.

¹⁰Do not have sex with your granddaughter, because that would disgrace you.