And the brethren immediately sent away Paul and Silas - Compare Acts 9:25. 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 prepared to leave the city.
Unto Berea - This was a city of Macedonia, near Mount Cithanes. “Bercea is on the eastern slope of the Olympian range, and commands an extensive view of the plain which is watered by the Haliacmon and Axius. It has many natural advantages, and is now considered one of the most agreeable towns in Rumili. Plane trees spread a grateful shade over its gardens. Streams of water are in every street. Its ancient name is said to have been derived from the abundance of its waters; and the name still survives in the modern Verria, or Kara-Verria. It is situated o the left of the Haliacmon, about 5 miles from the point where that river breaks through an immense rocky ravine from the mountains to the plain. A few insignificant ruins of the Greek and Roman periods may yet be noticed. It still boasts of 18,000 or 20,000 inhabitants, and is placed in the second rank of the cities of European Turkey” - Life and Epistles of Paul.