1 Thessalonians in Wikipedia

The First Epistle of Paul to the Thessalonians, usually referred to simply as First Thessalonians and often written 1 Thessalonians, is a book from the New Testament of the Christian Bible. The first letter to the Thessalonians was likely the first of Paul's letters, probably written by the end of A.D. 52[1], making it, so far as is now known, the oldest extant Christian document...

Link: https://en.wikipedia.org/wiki/1_Thessalonians