Leviticus 18:6, 9, 14

“‘No man is to approach any close relative to have sexual intercourse with her. I am the LORD.

You must not have sexual intercourse with your sister, whether she is your father’s daughter or your mother’s daughter, whether she is born in the same household or born outside it; you must not have sexual intercourse with either of them.

You must not expose the nakedness of your father’s brother; you must not approach his wife to have sexual intercourse with her. She is your aunt.