For this perhaps is why he was parted from you for a while, that you might have him back forever, no longer as a bondservant but more than a bondservant, as a beloved brother—especially to me, but how much more to you, both in the flesh and in the Lord. - Philemon 15-16
When Paul was an old man, Onesimus visited him while he was a prisoner for Christ Jesus with Epaphras. He sent Onesimus back to his master Philemon after asking Philemon via epistle to free his bondservant, welcome him as he would welcome Paul, and to charge all his debts to Paul's account to repay. He hoped, through Philemon's prayers, to be sent to him and even asked to have a guest room prepared. (Philemon)