Genesis 25:21-23

Darby Translation

²¹ And Isaac entreated Jehovah for his wife, because she was barren; and Jehovah was entreated of him, and Rebecca his wife conceived.

²² And the children struggled together within her; and she said, If [it be] so, why am I thus? And she went to inquire of Jehovah.

²³ And Jehovah said to her, Two nations are in thy womb, And two peoples shall be separated from thy bowels; And one people shall be stronger than the other people, And the elder shall serve the younger.