Then the dukes of Edom shall be amazed, Of which there were many, see Gen 36:15 the land being first governed by dukes, as perhaps it was at this time, though in some few years after it had a king, Num 20:14 now these, when they heard of the wonderful things that were done for Israel in Egypt, at the Red sea, and in the wilderness, were astonished and surprised, and filled with fear and dread, see Deu 2:4, the mighty men of Moab, trembling shall take hold upon them: as did on Balak the king of Moab, and his people, Num 22:2, where may be observed a literal accomplishment of this prophecy: all the inhabitants of Canaan shall melt away; as their hearts did, through fear, when they heard what God did for Israel against the Egyptians and the Amorites, and understood that they were upon the march to their land to invade it and dispossess them of it: see the fulfilment of this prediction in Jos 2:9 thus when Babylon shall be destroyed, as Pharaoh and his host were, and the people of God saved out of the midst of her, as Israel was, the kings of the earth will stand afar off for fear of her torment, and bewail and lament for her, Rev 18:9.