Genesis 25:19-23

And these are the generations of Isaac, Abraham’s son: Abraham begat Isaac: and 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. And Isaac entreated Jehovah for his wife, because she was barren: and Jehovah was entreated of him, and Rebekah his wife conceived. And the children struggled together within her; and she said, If it be so, wherefore do I live? And she went to inquire of Jehovah. And Jehovah said unto her, Two nations are in thy womb, And two peoples shall be separated from thy bowels: And the one people shall be stronger than the other people; And the elder shall serve the younger.