And, behold, here comes 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 has broken to the ground.
All Commentaries on Isaiah 21:9 Go To Isaiah 21
Peter Chrysologus
AD 450
[In the Gospels it is said,] “And he began to send them forth two by two.” He sent them two by two that no one of them, being abandoned and alone, might fall into a denial, like Peter, or flee, like John. Human frailty quickly falls if it proudly relies on itself, despises companions and is unwilling to have a colleague. As Scripture says, “Woe to him that is alone, for when he falls, he has none to lift him up.” The same Scripture testifies how much one is strengthened by another’s aid, when it states, “A brother that is helped by his brother is like a strong city.”
… This was done also to fulfill the prophecy of Isaiah, who testified that he had seen a rider of a two-horse chariot, when he heard it said to him, “What do you see?” And he replied, “I see a rider of a two-horse chariot.” Because of this he cried out right away that Babylon had fallen, and all its graven gods.
Who doubts, brothers, that by this two-horse chariot Christ was riding upon his saving journeys, since he sees that through the apostles’ preaching temples have fallen, idols have perished, the bleating of herds has ceased and the victims, along with even the very altars with their perfume of incense, have already disappeared through all the centuries.