Genesis 25:19-21 New American Standard Bible (NASB)

19. Now these are the records of the generations of Isaac, Abraham's son: Abraham became the father of Isaac;

20. and Isaac was forty years old when he took Rebekah, the daughter of Bethuel the Aramean of Paddan-aram, the sister of Laban the Aramean, to be his wife.

21. Isaac prayed to the Lord on behalf of his wife, because she was barren; and the Lord answered him and Rebekah his wife conceived.

Genesis 25