What did Paul say he thought he ought to do against Jesus of Nazareth?

Paul testified that he verily thought with himself that he ought to do many things contrary to the name of Jesus of Nazareth. He acknowledged he did these things in Jerusalem as a religious fanatic, persecuting believers and trying to stamp them out, believing he was doing God a favor.

Les teaches that Acts 26 rehearses Paul's past life in Judaism, when he was a Pharisee of the Pharisees. Paul persecuted the believers in Jerusalem who had become followers of Jesus of Nazareth, trying to stamp them out, and thought he was doing God a favor. Paul says he verily thought he ought to do many things contrary to the name of Jesus of Nazareth, and he did them as a religious fanatic. Les also notes Paul was alone when his apostolic ministry began, indicating he was not a bachelor with a grudge against marriage, but was alone at that time.

Acts 26:9

I verily thought with myself, that I ought to do many things contrary to the name of Jesus of Nazareth.

When did Paul think he ought to do many things contrary to the name of Jesus of Nazareth?

Paul thought this during his pre-salvation experience, while he was persecuting believers at Jerusalem. He verily thought with himself that he ought to do many things contrary to the name of Jesus of Nazareth, and he acted on it in Jerusalem, imprisoning many saints after receiving authority from the chief priests.