Judas Iscariot
There are several explanations as to why Judas betrayed Jesus. In the earliest account, in the Gospel of Mark, when he goes to the chief priests to betray Jesus, he is offered money as a reward, but it is not clear that money is his motivation. In the Gospel of Matthew account, on the other hand, he asks what they will pay him for handing Jesus over. In the Gospel of Luke and the Gospel of John, the devil enters into Judas, causing him to offer to betray Jesus. The Gospel of John account has Judas complaining that money has been spent on expensive perfumes to anoint Jesus which could have been spent on the poor, but adds that he was the keeper of the apostles' purse and used to steal from it.
Jesus Christ Superstar
Finally, Judas arrives with Roman soldiers and identifies Jesus by kissing him on the cheek ("The Arrest"). While Jesus is being arrested, his apostles attempt to fight the soldiers, Jesus tells them to let the soldiers take him to Caiaphas. On the way, a mob (acting like—and sometimes represented as—modern-day news reporters) asks Jesus what he plans to do, but Jesus declines to comment. When Jesus is brought to trial before the Sanhedrin, Caiaphas demands if he is the King of the Jews. Jesus responds: "That's what you say, you say that I am." This answer is affirmative according to Jewish custom, and that provides enough justification for the Pharisees to bring Jesus to Pilate. Meanwhile, Jesus's apostle Peter is confronted by an old man, a soldier and a maid, and Peter denies to each that he knows Jesus ("Peter's Denial"). Mary asks Peter why he denied Jesus, and Peter responds that he had to do it in order to save himself. Mary wonders how Jesus knew that Peter would deny him three times.