Acts 16:39

And they came and besought them - A most humiliating act for Roman magistrates, but in this case it was unavoidable. The apostles had them completely in their power, and could easily effect their disgrace and ruin. Probably they besought them by declaring them innocent; by affirming that they were ignorant that they were Roman citizens, etc.

And desired them to depart ... - Probably:

(1) To save their own character, and be secure from their taking any further steps to convict the magistrates of violating the laws; and,

(2) To evade any further popular tumult on their account. This advice Paul and Silas saw fit to comply with, after they had seen and comforted the brethren, Acts 16:40. They had accomplished their main purpose in going to Philippi; they had preached the gospel; they had laid the foundation of a flourishing church (compare the Epistle to the Philippians); and they were now prepared to prosecute the purpose of their agency into surrounding regions. Thus, the opposition of the people and the magistrates at Philippi was the occasion of the founding of the church there, and thus their unkind and inhospitable request that they should leave them was the means of the extension of the gospel into adjacent regions.