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

1:19 I Paul have written it with mine own hand, I will repay it: albeit I do not say to thee how thou owest unto me even thine own self besides.