Acts 26:10-11

10And that is just what I did in Jerusalem. On the authority of the chief priests I put many of the Lord’s people in prison, and when they were put to death, I cast my vote against them.

11Many a time I went from one synagogue to another to have them punished, and I tried to force them to blaspheme. I was so obsessed with persecuting them that I even hunted them down in foreign cities.