The Apostle Paul
1 Thessalonians 3:7BSB·traditional attribution

For this reason, brothers, in all our distress and persecution, we have been reassured about you, because of your faith.

Matthew Henry Presbyterian @wholebiblehenry

Here we have Paul's great satisfaction upon the return of Timothy with good tidings from the Thessalonians, in which we may observe, I. The good report Timothy made concerning them, Th1 3:6. Without question, he was a willing messenger of these good tidings. Concerning their faith, that is, concerning their stedfastness in the faith, that they were not shaken in mind, nor turned aside form the profession of the gospel.

Commenting on 1 Thessalonians 3:6-10

John Gill Reformed Baptist @doctorgill

Therefore, brethren, we were comforted over, you,.... Or "in you", as the Vulgate Latin version; or "from you", as the Arabic; or "by you", as the Syriac; or "for you", as the Ethiopic; that is, on account of them, either by what they had heard was in them, or had heard from them.

Albert Barnes Presbyterian @notesbybarnes

Verse 7. We were comforted over you. and following; , . The sense here is, that their steadfastness was a great source of comfort to him in his trials. It was an instance where the holy lives and the fidelity of a people did much, as will always be the case, to lighten the burdens and cheer the heart of a minister of the gospel.