The Apostle Paul
Colossians 4:9BSB·traditional attribution

With him I am sending Onesimus, our faithful and beloved brother, who is one of you. They will tell you about everything here.

John Calvin Reformed @genevareformer

He adds, Onesimus, that the embassy may have the more weight. It is, however, uncertain who this Onesimus was. For it can scarcely be believed that this is the slave of Philemon, inasmuch as the name of a thief and a fugitive would have been liable to reproach.

Matthew Henry Presbyterian @wholebiblehenry

In the close of this epistle the apostle does several of his friends the honour to leave their names upon record, with some testimony of his respect, which will be spoken of wherever the gospel comes, and last to the end of the world. I. Concerning Tychicus, Col 4:7.

Commenting on Colossians 4:7-18

John Gill Reformed Baptist @doctorgill

With Onesimus,.... Who had been Philemon's servant, ran away from him, and was met with and converted by the Apostle Paul, of whom he says many things in his epistle to his master. According to the Apostolic Constitutions, he was afterwards bishop of Beyrhoea; and some say he suffered martyrdom under Domitian; a servant of this name is mentioned by Suetonius (i), Ignatius (k) speaks...