John Chrysostom
The Evangelists seem to have divided the times among themselves. Matthew, after briefly surveying the time before John the Baptist's imprisonment, hastens on to the events that follow.
But the Evangelist John not only does not present that time briefly. He especially dwells on it.
Matthew, after Jesus' coming from the wilderness, passes over the intervening events in silence. For example, he omits what John preached and what the Jews sent to him said.
Having summarized all the rest, he immediately passes to the imprisonment. "When Jesus heard," he says, "that John had been delivered up, He withdrew" from there (Mt 4:12).
But John did not do this. He passes over in silence the departure into the wilderness, of which Matthew spoke.
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He narrates the events after Jesus came down from the mountain. After relating many things, he then adds: "For John had not yet been put in prison" (Jn 3:24).
But why, you ask, does Jesus now come to John, and not once only, but a second time? Matthew says that He had to come for baptism.
Jesus Himself indicates this when He adds: "For thus it is fitting for us to fulfill all righteousness" (Mt 3:15).
John shows that He came a second time, already after the baptism. He notes this through the words of the Baptist: "I saw the Spirit descending from heaven like a dove, and He remained upon Him" (v. 32).
Why, then, does He come to John? He did not simply come there, but came precisely to him. It is said, "John sees Jesus coming toward him."
Since John baptized Him together with many others, many might suppose that He came to John for the same reason as the others.
That is, they might think He came to confess sins and to be washed in the river with repentance.
Therefore Jesus comes again, so that He might give John himself the opportunity to correct this impression.
Indeed, when John said, "Behold, the Lamb of God, Who takes away the sin of the world" (v. 29), he completely destroyed such a suspicion.
If He is so pure that He can even absolve the sins of others, it is clear that He does not come to confess His own sins.
Rather, He comes to give the wondrous preacher an occasion, by repeating what had been said before, to instill it more precisely in the hearers. He also adds something else to what had already been said about Him.
The particle "behold" is used because many, from John's words, had long desired to see Him. Therefore John points Him out when He appears and says, "Behold," thereby showing that He is the One long awaited.
"Behold, the Lamb." He calls Him the Lamb, recalling to the Jews Isaiah's prophecy and the type from the time of Moses, so that through the type he might bring them nearer to the truth.
But the Old Testament lamb never took upon itself anyone's sins. This One took the sins of the whole world and delivered it from the wrath of God when destruction threatened it.