The Apostle Paul
Philemon 1:5BSB·traditional attribution

because I hear about your faith in the Lord Jesus and your love for all the saints.

John Calvin Reformed @genevareformer

5. Hearing of thy love and faith. This praise, which he bestows on Philemon, includes briefly the whole perfection of a Christian man. It consists of two parts, faith in Christ, and love towards our neighbors; for to these all the actions and all the duties of our life relate.

Matthew Henry Presbyterian @wholebiblehenry

I. In the first two verses of the preface we have the persons from and to whom it is written, with some annexed note or title, implying somewhat of argument to the purpose of the letter. 1. The persons writing: Paul, the principal, who calls himself a prisoner of Jesus Christ, that is, for Jesus Christ.

Commenting on Philemon 1:1-7

John Gill Reformed Baptist @doctorgill

Hearing of thy love and faith,.... Those two spring from the free favour and love of God, and are the pure gifts of his grace; and therefore thanks are to be given for them to God; nor are they to be ascribed to the power and will of man; they are the fruits of the Spirit of God; and are the principal ingredients in sanctification...