Isaiah 21: 6-10. “For thus hath the Lord said unto me, Go, set a watchman, let him declare what he seeth. And he saw a chariot with a couple of horsemen, a chariot of asses, and a chariot of camels; and he hearkened diligently with much heed: And he cried, A lion; My lord, I stand continually upon the watchtower as in the daytime,and I am set in my ward whole nights: And, behold, here cometh a chariot of men, with a couple of horsemen. And he answered and said, Babylon is fallen, is fallen; and all the graven images of her gods he hath broken unto the ground. O my threshing, and the corn of my floor: that which I have heard of the Lord of hosts, the God of Israel, have I declared unto you.”
Isaiah is still a part of his vision, and the Lord commanded him to set a watchman in the tower to announce what was come to pass. The watchman saw chariots (some render it cavalry) marching to the destruction of Babylon; horsemen and chariots approaching with rapidity, fierceness, and terror of a lion upon its prey: and a voice cried, “Babylon is fallen!” It was repeated for emphasis and to denote certainty.
Babylon was noted for its idolatry. It was perhaps the place where the worship of idols began. The principal god was Bel.
The destruction of the city was compared to threshing wheat by treading it under foot in a threshing floor. When it was over, all that was left was useless chaff.