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Epistle to Philemon
This book of the Bible was written from Rome at the same time as the epistles to the Colossians and Ephesians, and was sent also by Onesimus. It was addressed to Philemon and the members of his family.
It was written for the purpose of interceding for Onesimus, who had deserted his master Philemon and been “unprofitable” to him. Paul had found Onesimus at Rome, and had there been instrumental in his conversion, and now he sends him back to his master with this letter.
This epistle has the character of a strictly private letter, and is the only one of such epistles preserved to us.