In our study of 1 Thessalonians chapter one, we look at the letter that Paul wrote to the "church" that he started in Thessalonica. We see how they not only accepted the Lord Jesus Christ but put that faith into action and impacted the whole region of Macedonia.
Thessalonica, a city in modern Greece, was a Roman colony and adopted much of the Roman culture. This epistle (letter) was written to the "church" that was started when Paul visited there in Acts 17. Paul was ran out of town after a few weeks as the Jewish leaders became jealous of what God was doing through Paul. Later, Paul sent Timothy back to Thessalonica to check to see how the believers were doing and he was able to report that they were putting their faith into action.