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
At what Jesus knows will be the Last Supper, he pours wine and passes bread for his apostles ("The Last Supper"). Very aware of the ordeal he faces, he is stung when the others pay little attention to him; "For all you care this wine could be my blood / For all you care this bread could be my body," he remarks, alluding to (and anticipating) the Christian doctrine of the Eucharist. He asks them to remember him when they eat and drink; he predicts that Peter will deny him three times "in just a few hours" and that one of them will betray him. Judas, believing that Jesus already knows ("cut the dramatics, you know very well who"), admits he is the one and angrily accuses Jesus of acting recklessly and egotistically. Claiming he does not understand Jesus's decisions, he leaves to bring the Roman soldiers.