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
The Last Supper is the final meal that Jesus shares with his 12 apostles in Jerusalem before his crucifixion. The Last Supper is mentioned in all four canonical gospels; Paul's First Epistle to the Corinthians () also refers to it. During the meal, Jesus predicts that one of his apostles will betray him. Despite each Apostle's assertion that he would not betray him, Jesus reiterates that the betrayer would be one of those present. and specifically identify Judas as the traitor.