The resurrection of Jesus is one of the most investigated events in history.
Some who have tried to disprove it have ended up convinced that it really happened. Jesus taught his followers that he would not only be killed as the atonement for our sins, but would rise from the grave:
“We are going up to Jerusalem,” he said, “and the Son of Man will be delivered over to the chief priests and the teachers of the law. They will condemn him to death and will hand him over to the Gentiles, who will mock him and spit on him, flog him and kill him. Three days later he will rise.” (Mark 10:33–34, NIV)
For what I received I passed on to you as of first importance: that Messiah died for our sins according to the Scriptures, that he was buried, that he was raised on the third day according to the Scriptures, and that he appeared to Peter, and then to the Twelve. After that, he appeared to more than five hundred of the brothers at the same time. (1 Corinthians 15:3–6, NIV)
So convinced were his followers that Yeshua had risen from death, that they staked their entire faith on it:
If Messiah has not been raised, your faith is futile; you are still in your sins. (1 Corinthians 15:17, NIV)
In fact, some of those who saw him after his resurrection were later persecuted or even put to death for testifying that they had seen him alive after his crucifixion. They were convinced that God had raised Yeshua!