Philemon 1:10-12

1:10 I am appealing to you concerning my child, whose spiritual father I have become during my imprisonment, that is, Onesimus, 1:11 who was formerly useless to you, but is now useful to you and me. 1:12 I have sent him (who is my very heart) back to you.

Philemon 1:19

1:19 I, Paul, have written this letter with my own hand: I will repay it. I could also mention that you owe me your very self.