Expositor's Bible Commentary Commentary John 13:21

"When Jesus had thus said, he was troubled in the spirit, and testified, and said, Verily, verily, I say unto you, that one of you shall betray me." — John 13:21 (ASV)

Jesus was not surprised that Judas would betray him. He had announced it to the disciples at least a year earlier (6:70). Nevertheless, it “troubled” him immensely (the same verb is used of Jesus’ agitation in 11:33 and 12:27). As “the hour” approached, the bitterness of the betrayal Jesus anticipated became known.