Leviticus 18:6-9

⁶“‘None of you shall approach any close relatives, to uncover their nakedness: I am the LORD.

⁷“‘You shall not uncover the nakedness of your father, nor the nakedness of your mother: she is your mother. You shall not uncover her nakedness.

⁸“‘You shall not uncover the nakedness of your father’s wife. It is your father’s nakedness.

⁹“‘You shall not uncover the nakedness of your sister, the daughter of your father, or the daughter of your mother, whether born at home or born abroad.