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
According to medieval copies (the earliest copies from the 15th century) of the Gospel of Barnabas it was Judas, not Jesus, who was crucified on the cross. This work states that Judas's appearance was transformed to that of Jesus', when the former, out of betrayal, led the Roman soldiers to arrest Jesus who by then was ascended to the heavens. This transformation of appearance was so identical that the masses, followers of Christ, and even the Mother of Jesus, Mary, initially thought that the one arrested and crucified was Jesus himself. The gospel then mentions that after three days since burial, Judas' body was stolen from his grave, and then the rumors spread of Jesus being risen from the dead. When Jesus was informed in the third heaven about what happened, he prayed to God to be sent back to the earth, and descended and gathered his mother, disciples, and followers, and told them the truth of what happened. He then ascended back to the heavens, and will come back at the end of times as a just king.