A.T. Robertson Commentary Acts 22:19

"And I said, Lord, they themselves know that I imprisoned and beat in every synagogue them that believed on thee:" — Acts 22:19 (ASV)

Imprisoned and beat (ημην φυλακιζων κα δερων). Periphrastic imperfect active of φυλακιζω (LXX and late Koine, here alone in the N.T.) and δερω (old verb to skin, to beat as in Mt 21:35 which see).

In every synagogue (κατα τας συναγογας). Up and down (κατα) in the synagogues.