Genesis 25:19-22

Now these are the records of the generations of Isaac, Abraham’s son: Abraham became the father of Isaac; 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. Isaac prayed to the LORD on behalf of his wife, because she was barren; and the LORD answered him and Rebekah his wife conceived. But the children struggled together within her; and she said, “If it is so, why then am I this way?” So she went to inquire of the LORD.