Paul told about how he had persecuted Christians.

Acts 26:9-11

9 “Formerly I, too, was sure that I should do everything that I could to oppose Jesus [MTY], the man from Nazareth town. 10 So that is what I did when I lived in Jerusalem. I put many of the believers in jail, as the chief priests there had authorized me to do. When the Jewish leaders wanted those Christians killed {someone to kill those Christians}, I voted for that. 11 Many times I punished the believers whom I found in Jewish meeting places. By punishing them, I tried to force them to speak evil about Jesus. I was so angry with the followers of Jesus that I even traveled to other cities to find them and do things to harm them.”