John Gill

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. This gave abundant consolation in all our affliction and distress: which they met with at Corinth, where the apostle laboured with his own hands, and ministered to his own, and the necessities of others, and was greatly opposed, reproached, and persecuted; see Act 18:3, but the news of the good estate and condition the Thessalonians were in, was a great relief and comfort to him, particularly their faith: by your faith: by the report of it, that it grew exceedingly, and that they walked in the truth; see Jo1 5:4. The Alexandrian copy reads, "in all your distress and affliction, and by your faith."