Genesis 25:22 YLT

²⁰  and Isaac is a son of forty years in his taking Rebekah, daughter of Bethuel the Aramaean, from Padan-Aram, sister of Laban the Aramaean, to him for a wife.

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.'

²⁴  And her days to bear are fulfilled, and lo, twins 'are' in her womb;