There was at Philippi, as appears Acts 16:12, a colony of the Romans, and they were governed by their laws, by which they might make no innovation in religion without the consent of the senate, and afterwards of their emperors; which here these persecutors allege.
Related Commentaries of Acts 16:21
Acts 16:21
21 And teach customs, which are not lawful for us to receive, neither to observe, being Romans.