Jn 13:21-33, 36-38
21[Reclining at table with his disciples,] Jesus was deeply troubled and testified, “Amen, amen, I say to you, one of you will betray me.” ... 23One of his disciples, the one whom Jesus loved, was reclining at Jesus’ side. 24So Simon Peter nodded to him to find out whom he meant. 25He leaned back against Jesus’ chest and said to him, “Master, who is it?” 26Jesus 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. 27After he took the morsel, Satan entered him. So Jesus said to him, “What you are going to do, do quickly.” ... 30So he took the morsel and left at once. And it was night.
31When he had left, Jesus said, “Now is the Son of Man glorified, and God is glorified in him. 32[If God is glorified in him,] God will also glorify him in himself, and he will glorify him at once. 33My children, I will be with you only a little while longer. You will look for me, and as I told the Jews, ‘Where I go you cannot come,’ so now I say it to you.”
36Simon Peter said to him, “Master, where are you going?” Jesus answered [him], “Where I am going, you cannot follow me now, though you will follow later.” 37Peter said to him, “Master, why can’t I follow you now? I will lay down my life for you.” 38Jesus answered, “Will you lay down your life for me? Amen, amen, I say to you, the cock will not crow before you deny me three times.”
Judas the Betrayer: The unfortunate apostle is called Judas Iscariot or the son of Simon the Iscariot. “Iscariot” would identify Judas as “a man (Hebrew ’ish) from Kerioth.” Kerioth may be a place in Moab (Jer 48:24) or Keriot-Hezron, south of Hebron (Jos 15:25). On either count, Judas seems to be the only non-Galilean among the Twelve.
What motivated Judas to betray his Master? Was it disillusionment with Jesus? Luke suggests that Satan prompted Judas to do it: “then Satan entered into Judas” (Lk 22:3). John has a similar statement: Satan enters Judas as soon as he takes the morsel from Jesus. But as far as human motivation is concerned, John says that Judas did it for money. During the anointing of Jesus in Bethany, when Judas complained about the waste of ointment and that the money could have been given to the poor, the evangelist notes: “He said this not because he cared about the poor but because he was a thief and held the money bag and used to steal the contributions” (Jn 12:6). The imperfect tense of the verb bastazo (to steal) implies that stealing was Judas’ practice.