Genesis 25:21-23 Young's Literal Translation (YLT)
21 And Isaac maketh entreaty to Jehovah before his wife, for she [is] barren: and Jehovah is entreated of him, and Rebekah his wife conceiveth,
22 and the children struggle together within her, and she saith, `If [it is] right -- why [am] I thus?' and she goeth to seek Jehovah.
23 And Jehovah saith to her, `Two nations [are] in thy womb, and two peoples from thy bowels are parted; and the [one] people than the [other] people is stronger; and the elder doth serve the younger.'