When he had said this, Jesus was deeply troubled and testified, "Amen, amen, I say to you, one of you will betray me." The disciples looked at one another, at a loss as to whom he meant. One of his disciples, the one whom Jesus loved, was reclining at Jesus' side. So Simon Peter nodded to him to find out whom he meant. He leaned back against Jesus' chest and said to him, "Master, who is it?"
Jesus answered, "It is the one to whom I hand the morsel after I have dipped it." So he dipped the morsel and (took it and) handed it to Judas, son of Simon the Iscariot. After he took the morsel, Satan entered him. So Jesus said to him, "What you are going to do, do quickly." (Now) none of those reclining at table realized why he said this to him. Some thought that since Judas kept the money bag, Jesus had told him, "Buy what we need for the feast," or to give something to the poor. So he took the morsel and left at once. And it was night. (John 13:21-30)