1:1 Paul, a prisoner for Christ Jesus, and Timothy our brother,
To Philemon our beloved fellow worker 2 and Apphia our sister and Archippus our fellow soldier, and the church in your house:
3 Grace to you and peace from God our Father and the Lord Jesus Christ.
Douglas Moo on the significance of Paul addressing the letter concerning Philemon and his slave Onesimus:
"By making the issue of Onesimus a public one, Paul increases the pressure on Philemon to respond as he wishes. But we should not view the public nature of the letter as simply a lawyer's tactic to win his case; it rather reflects the corporate nature of early Christianity, in which no matter was "private" but inevitably affected, and was affected by, one's brothers and sisters in the new family of God."(Moo, Douglas J. The Letters to the Colossians and to Philemon. Grand Rapids, Mich.: William B. Eerdmans Pub., 2008. Print.)