Leviticus 18:6-9

⁶None of you shall approach to any that are near of kin to him, to uncover their nakedness: I am Jehovah.

⁷The nakedness of thy father, even the nakedness of thy mother, shalt thou not uncover: she is thy mother; thou shalt not uncover her nakedness.

⁸The nakedness of thy father’s wife shalt thou not uncover; it is thy father’s nakedness.

⁹The nakedness of thy sister, the daughter of thy father, or the daughter of thy mother, whether born at home, or born abroad, even their nakedness thou shalt not uncover.