Epistle to Philemon in Wikipedia

The Epistle of Paul to Philemon, usually referred to simply as Philemon, is a prison letter to Philemon from Paul of Tarsus. Philemon was a leader in the Colossian church. This letter, which is one of the books of the New Testament, deals with forgiveness. It is now generally regarded as one of the undisputed works of Paul. It is the shortest of Paul's extant letters, consisting of only 335 words in the original Greek text and 25 verses in modern English translations...

Link: https://en.wikipedia.org/wiki/Book_of_Philemon