TSK · Genesis 27:37

Yahweh said to her, "Two nations are in your womb. Two peoples will be separated from your body. The one people will be stronger than the other people. The elder will serve the younger."

He put garrisons in Edom; throughout all Edom put he garrisons, and all the Edomites became servants to David. Yahweh gave victory to David wherever he went.

Not only so, but Rebecca also conceived by one, by our father Isaac.