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
In the Eastern Orthodox hymns of Holy Wednesday (the Wednesday before Pascha), Judas is contrasted with the woman who anointed Jesus with expensive perfume and washed his feet with her tears. According to the Gospel of John, Judas protested at this apparent extravagance, suggesting that the money spent on it should have been given to the poor. After this, Judas went to the chief priests and offered to betray Jesus for money. The hymns of Holy Wednesday contrast these two figures, encouraging believers to avoid the example of the fallen disciple and instead to imitate Mary's example of repentance. Also, Wednesday is observed as a day of fasting from meat, dairy products, and olive oil throughout the year in memory of the betrayal of Judas. The prayers of preparation for receiving the Eucharist also make mention of Judas's betrayal: "I will not reveal your mysteries to your enemies, neither like Judas will I betray you with a kiss, but like the thief on the cross I will confess you."