The apostles were surprised when Jesus announced that one of them would betray him, for they did not suspect treachery among them. Perhaps they thought that one of them might unintentionally betray him through speaking carelessly. But Judas knew what Jesus meant (Matt 26:20-22; John 13:21-25).
When Jesus took a piece of bread, dipped it in the dish and gave it to Judas, he was giving Judas a special honour. It was as if Jesus was making a last appeal to him. But Judas’ heart was set on doing evil. Jesus knew Judas’ intentions, but the apostles still did not suspect him of being a traitor (Matt 26:23-25; John 13:26-30).
Judas’ departure from the room made the death of Jesus certain, though for Jesus that death would be not a misfortune but a glorious triumph. His death would bring glory to God by displaying his immeasurable love for sinful men and women. It would also bring grief to his disciples as they saw their master taken from them. But they were to show no bitterness in their grief; rather, a forgiving love, by which others would see that they were indeed disciples of Jesus (John 13:31-35).