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.
Ministry of Jesus
In that week, the synoptics also narrate conflicts between Jesus and the elders of the Jews, in episodes such as the Authority of Jesus Questioned and the Woes of the Pharisees, in which Jesus criticizes their hypocrisy. Judas Iscariot, one of the twelve apostles, approaches the Jewish elders and performs the "Bargain of Judas" in which he accepts to betray Jesus and hand him over to the elders. Matthew specifies the price as thirty silver coins.