Leviticus 18:15-17

15You must not have sexual intercourse with your daughter-in-law; she is your son’s wife. You must not have intercourse with her.

16You must not have sexual intercourse with your brother’s wife; she is your brother’s nakedness.

17You must not have sexual intercourse with both a woman and her daughter; you must not take as wife either her son’s daughter or her daughter’s daughter to have intercourse with them. They are closely related to her – it is lewdness.