The Epistle of Paul the Apostle to Philemon is a personal letter in which the apostle beseeches Philemon to take back a runaway slave, Onesimus. The slave had come to Rome, where Paul was being held prisoner, and there had been converted by Paul.

Philemon 1

1:1 Paul, a prisoner of Jesus Christ, and Timothy our brother, unto Philemon our dearly beloved, and fellow-labourer,