Leviticus 18:4-8

You are to perform My judgments and keep My statutes, to live in accord with them; I am the Lord your God.

So you shall keep My statutes and My judgments, which, if a person follows them, then he will live by them; I am the Lord.

‘None of you shall approach any blood relative of his to uncover nakedness; I am the Lord.

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.