Genesis 25:21-23

ASV(i) 21 And Isaac entreated Jehovah for his wife, because she was barren: and Jehovah was entreated of him, and Rebekah his wife conceived. 22 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. 23 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.