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.
Yeshu
According to Dr. Rubenstein, the account in "Sanhedrin" 107b recognizes the kinship between Christians and Jews, since Jesus is presented as a disciple of a prominent Rabbi. But it also reflects and speaks to an anxiety fundamental to Rabbinic Judaism. Prior to the destruction of the Temple in 70, Jews were divided into different sects, each promoting different interpretations of the law. Rabbinic Judaism domesticated and internalized conflicts over the law, while vigorously condemning any sectarianism. In other words, rabbis are encouraged to disagree and argue with one another, but these activities must be carefully contained, or else they could lead to a schism. Although this story may not present a historically accurate account of Jesus' life, it does use a fiction about Jesus to communicate an important truth about the Rabbis. Moreover, Rubenstein sees this story as a rebuke to overly harsh Rabbis. Boyarin suggests that the Rabbis were well aware of Christian views of the Pharisees and that this story acknowledges the Christian belief that Jesus was forgiving and the Pharisees were not (see Mark 2:1-2), while emphasizing forgiveness as a necessary Rabbinic value.