Leviticus 18:7-11

You shall not uncover the nakedness of your father, that is, the nakedness of your mother. She is your mother; you are not to uncover her nakedness.

You shall not uncover the nakedness of your father’s wife; it is your father’s nakedness.

As for the nakedness of your sister, either your father’s daughter or your mother’s daughter, whether born in the household or born outside the household, you shall not uncover their nakedness.

The nakedness of your son’s daughter or your daughter’s daughter, their nakedness you shall not uncover; for their nakedness is yours.

The nakedness of your father’s wife’s daughter, born to your father, she is your sister; you shall not uncover her nakedness.