Moses
Genesis 25:23ESV·traditional attribution

And the LORD said to her, “Two nations are in your womb, and two peoples from within you shall be divided; the one shall be stronger than the other, the older shall serve the younger.”

John Calvin Reformed @genevareformer

23. Two nations. In the first place, God answers that the contention between the twin-brothers had reference to something far beyond their own persons; for in this way he shows that there would be discord between their posterities. When he says, there are two nations, the expression is emphatical; for since they were brothers and twins, and therefore of one blood, the mother did not...

Matthew Henry Presbyterian @wholebiblehenry

We have here an account of the birth of Jacob and Esau, the twin sons of Isaac and Rebekah: their entrance into the world was (which is not usual) one of the most considerable parts of their story; nor is much related concerning Isaac but what had reference to his father while he lived and to his sons afterwards.

Commenting on Genesis 25:19-28

John Gill Reformed Baptist @doctorgill

And the Lord said unto her,.... Either by one or other of the above persons she acquainted with this affair, and entreated to seek the Lord for her; or by an impulse upon her own mind: two nations are in thy womb; or two persons, from whom two nations will spring, the Edomites and Israelites, the one from Esau, the other from Jacob: and two...