Philemon 1:8-11 (RSV):

8 Accordingly, though I am bold enough in Christ to command you to do what is required, 9 yet for love’s sake I prefer to appeal to you—I, Paul, an ambassador[a] and now a prisoner also for Christ Jesus— 10 I appeal to you for my child, Ones′imus, whose father I have become in my imprisonment. 11 (Formerly he was useless to you, but now he is indeed useful[b] to you and to me.)