NET
13 I wanted to keep him with me so that he could serve me in your place during my imprisonment for the sake of the gospel.
Darby
13 whom *I* was desirous of keeping with myself, that for thee he might minister to me in the bonds of the glad tidings;
KJV
13 Whom I would have retained with me, that in thy stead he might have ministered unto me in the bonds of the gospel: