4:23
Forbidden to you (are) your mothers and your daughters and your sisters and your father's sisters and your mother's sisters and daughters (of) brothers, and daughters (of) sisters and (the) mothers who nursed you and your sisters from the nursing and mothers (of) your wives and your step daughters who (are) in your guardianship of your women whom you had relations with them, but if not you had relations with them, then (there is) no sin on you. And wives (of) your sons, those who (are) from your loins and that you gather together [between] two sisters except what has passed before. Indeed, Allah is Oft-Forgiving, Most-Merciful.