The letter to Philemon was one of Paul’s prison letters, possibly written from Ephesus in 53–55. Though sent to an individual, it is not strictly private, for the recipient is called a coworker with a church in his house (vv. 1–2), and Paul writes in association with other fellow workers (1, 23–24). The letter consists chiefly of thanksgiving (4–7) and a petition on behalf of Onesimus (8–21).
Traditionally, expositors have found here a plea on behalf of a slave who had either misappropriated funds and run away or had not returned from a commission (an “example …