Genesis 25:21-23

Now Isaac pleaded with the LORD for his wife, because she was barren; and the LORD granted his plea, and Rebekah his wife conceived. But 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. And 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.”