Abraham Married His Sister, and God Blessed the Union
And Abraham said,... She is my sister; she is the daughter of my father, but not the daughter of my mother; and she became my wife. (Gen. 20: 11, 12.)
And God said unto Abraham, As for Sarah, thy wife,... I will bless her, and give thee a son also of her. (Gen. 17: 15, 16.)