The First Epistle to the Thessalonians is the fifty-second book in the Christian Bible, and the thirteenth in the New Testament.
This book is believed to a letter from the Apostle Paul to a church in Thessalonica in modern-day Greece. It is likely the first of Paul's letters, probably written by the end of AD 52[1] (however, some scholars believe the Epistle to Galatians may have been written at an earlier date: AD 48[2]).