Genesis 25:21-23

21Now Isaac pleaded with the Lord for his wife, because she was barren; and the Lord granted his plea, and Rebekah his wife conceived.

22But the children struggled together within her; and she said, “If all is well, why am I like this?” So she went to inquire of the Lord.

23And the Lord said to her: “Two nations are in your womb, Two peoples shall be separated from your body; One people shall be stronger than the other, And the older shall serve the younger.”