Genesis 25:19-24

Now these are the records of the descendants of Isaac, Abraham’s son: Abraham was the father of Isaac. Isaac was forty years old when he married Rebekah, the daughter of Bethuel the Aramean (Syrian) of Paddan-aram, the sister of Laban the Aramean. Isaac prayed to the LORD for his wife, because she was unable to conceive children; and the LORD granted his prayer and Rebekah his wife conceived [twins]. But the children struggled together within her [kicking and shoving one another]; and she said, “If it is so [that the LORD has heard our prayer], why then am I this way?” So she went to inquire of the LORD [praying for an answer]. The LORD said to her, “[The founders of] two nations are in your womb; And the separation of two nations has begun in your body; The one people shall be stronger than the other; And the older shall serve the younger.” When her days to be delivered were fulfilled, behold, there were twins in her womb.