Acts 26:10

Which thing I also did in Jerusalem Saul must have been a most active and prominent agent in the work of persecution in Jerusalem, for we learn here that the death of Stephen was not the only one for which he had given his vote. He had also had the warrant of the chief priests for other arrests beside those he intended to make in Damascus. We can see that the slaughter of the Christians was not in all cases the result of a sudden outburst of rage at some act or speech, but that some of them were imprisoned, then subjected to a form of trial, and afterwards put to death as men condemned by law.