Philemon 1:10-16

I appeal to you for my [own spiritual] child Onesimus, whom I have fathered [in the faith] while a captive in these chains. Once he was useless to you, but now he is indeed useful to you as well as to me. I have sent him back to you in person, that is, like sending my very heart. I would have chosen to keep him with me, so that he might minister to me on your behalf during my imprisonment for the gospel; but I did not want to do anything without first getting your consent, so that your goodness would not be, in effect, by compulsion but of your own free will. Perhaps it was for this reason that he was separated from you for a while, so that you would have him back forever, no longer as a slave, but [as someone] more than a slave, as a brother [in Christ], especially dear to me, but how much more to you, both in the flesh [as a servant] and in the Lord [as a fellow believer]. [Col 4:9]