Genesis 36:31 - Joseph Benson’s Commentary on the Old and New Testaments

By degrees the Edomites worked out the Horites, and got full possession of the country. They were ruled by kings who governed the whole country, and seem to have come to the throne by election, and not by lineal descent: these kings reigned in Edom before there reigned any king over the children of Israel That is, before Moses's time, for he was king in Jeshurun. God had lately promised Jacob that kings should come out of his loins: yet Esau's blood becomes royal long before any of Jacob's did. Probably it was a trial to the faith of Israel, to hear of the power of the kings of Edom, while they were bond-slaves in Egypt: but those that look for great things from God must be content to wait for them. God's time is the best time.