Genesis 25:21 in the King James Version
And Isaac intreated the LORD for his wife, because she was barren: and the LORD was intreated of him, and Rebekah his wife conceived.
Context
20 Isaac was forty years old when he took Rebekah, the daughter of Bethuel the Syrian of Paddan Aram, the sister of Laban the Syrian, to be his wife.
21 Isaac entreated the LORD for his wife, because she was barren. The LORD was entreated by him, and Rebekah his wife conceived.
22 The children struggled together within her. She said, “If it is like this, why do I live?” She went to inquire of the LORD.