Philemon was a wealthy Christian who hosted a house church in Colosse. One of Philemon's slaves, Onesimus, had fled and met Paul. Paul was sending Onesimus back to Philemon with this letter, asking Philemon to receive Onesimus back as a brother rather than a slave. The letter discusses Paul's prayers for Philemon's faith and understanding of God. It also provides a summary of upcoming prayer requests, including trips, ministry work, and church growth.