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.
Judas Iscariot
Most scholars reject these arguments for non-historicity, noting that there is nothing in the gospels to associate Judas with Judeans except his name, which was an extremely common one for Jewish men during the first century, and that numerous other figures named "Judas" are mentioned throughout the New Testament, none of whom are portrayed negatively. Positive figures named Judas mentioned in the New Testament include the prophet Judas Barsabbas (Acts 15:22-33), Jesus's brother Jude (Mark 6:3; Matt 13:55; Jude 1), and the apostle Judas the son of James (Luke 6:14-16; Acts 1:13; John 14:22). B. J. Oropeza argues that Christians should not repeat the historic tragedy of associating Judas Iscariot with the Judeans but regard him instead as an emergent Christian apostate, and hence, one of their own. His betrayal over a sum of money warns auditors against the vice of greed.