Col.4.9  and with him Onesimus, the faithful and beloved brother, who is one of yourselves. They will tell you of everything that has taken place here.
Phlm.1.10  I appeal to you for my child, Onesimus, whose father I have become in my imprisonment.

Hyper-concordance v1.1, by Sean Boisen. Scripture verses taken from the Revised Standard Version, copyright 1952, 1971.