A.T. Robertson Commentary Acts 22:12

"And one Ananias, a devout man according to the law, well reported of by all the Jews that dwelt there," — Acts 22:12 (ASV)

A devout man according to the law (ευλαβης κατα τον νομον). See on 2:5; 8:2; Luke 2:25 for the adjective ευλαβης. Paul adds "according to the law" to show that he was introduced to Christianity by a devout Jew and no law-breaker (Lewin).