Isaiah 21:10

7 and when he sees a troop, horsemen in pairs, a troop of donkeys, a troop of camels, he shall listen diligently with much heed.

8 He cried as a lion: Lord, I stand continually on the watch-tower in the day-time, and am set in my ward whole nights;

9 and, behold, here comes a troop of men, horsemen in pairs. He answered, Fallen, fallen is Babylon; and all the engraved images of her gods are broken to the ground.

10 You my threshing, and the grain of my floor! that which I have heard from Yahweh of hosts, the God of Israel, have I declared to you.

11 The burden of Dumah. One calls to me out of Seir, Watchman, what of the night? Watchman, what of the night?

12 The watchman said, The morning comes, and also the night: if you will inquire, inquire you: turn you, come.

13 The burden on Arabia. In the forest in Arabia shall you lodge, you caravans of Dedanites.