Albert Barnes Commentary Acts 17:10

"And the brethren immediately sent away Paul and Silas by night unto Beroea: who when they were come thither went into the synagogue of the Jews." — Acts 17:10 (ASV)

And the brethren immediately sent away Paul and Silas. . They did this for their safety. Yet this was not done until the gospel had taken deep root in Thessalonica. Having preached there, and laid the foundation of a church; having thus accomplished the purpose for which they went there, they were prepared to leave the city. Paul afterwards addressed two epistles to the church in this city.

Unto Berea. This was a city of Macedonia, near Mount Cithanes. There is a medal of Berea extant, remarkable for being inscribed, "of the second Macedonia."