Isaac was forty years old when he took Rebekah, the daughter of Bethuel the Aramaean of Paddan-aram, and the sister of Laban the Aramaean, to be his wife.
And the sons of Keturah, Abraham's servant-wife: she was the mother of Zimran and Jokshan and Medan and Midian and Ishbak and Shuah. And the sons of Jokshan: Sheba and Dedan.
And he made with him the agreement of which circumcision was the sign. And so Abraham had a son, Isaac, and gave him circumcision on the eighth day; and Isaac had a son, Jacob, and Jacob was the father of the twelve heads of the families of Israel.