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.
Gospel of Judas
Eleven of the disciples Jesus chose to spread his message misunderstood the central tenets of his teaching. They were obsessed with the physical world of the senses. The author says that they continued to practise religious animal sacrifice, which pleased the lower gods but did not help to foster a connection with the true God. They wrongly taught that those martyred in the name of Christ would be bodily resurrected.