As touching zeal (kata zēlos). So the old MSS. treating zēlos as neuter, not masculine. He was a zealot against Christianity, “persecuting the church” (diōkōn tēn ekklēsian). He was the ringleader in the persecution from the death of Stephen till his own conversion (Acts 8:1-9:9).
Found blameless (genomenos amemptos). “Having become blameless” (Gal 1:14). He knew and practised all the rules of the rabbis. A marvellous record, scoring a hundred in Judaism.