Behold. This exclamation would seem to indicate that the events predicted were very near at hand, as it were, already in sight. Shall be betrayed; παραδοθη ìσεται: shall be delivered; the same word as in the next verse.
God "spared not his own Son, but delivered him up for us all" (Romans 8:32). The special agent of this betrayal is not here named. Of his future crime, Judas, one of the twelve, had probably no thought, the devil not having yet put it into his heart.
The chief priests (see on Matthew 16:21). Shall condemn him. This was the act of the Sanhedrin, who could doom, but could not execute (John 18:31). The announcement of his death and resurrection had already been made at least twice before—once after Peter's great confession (Matthew 16:21), and again at the Transfiguration.