2 Thessalonians 3:3 (BSB)

But the Lord is faithful, and He will strengthen you and guard you from the evil one.

From 2 Thessalonians 3. Also in the ESV.

Commentary on 2 Thessalonians 3:3

• John Calvin (Reformed), Calvin's Commentaries on 2 Thessalonians 3:3: 3 But God is faithful. As it was possible that their minds, influenced by unfavorable reports, might come to entertain some doubts as to Paul’s ministry, having taught them that faith is not always found in men, he now calls them back to God, and says that he is faithful, so as to confirm them against all contrivances of men, by which they will endeavor to shake them.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on 2 Thessalonians 3:1-5: In these words observe, I. The apostle desires the prayers of his friends: Finally, brethren, pray for us, Th2 3:1. He always remembered them in his prayers, and would not have them forget him and his fellow-labourers, but bear them on their hearts at the throne of grace. Note, 1.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on 2 Thessalonians 3:3: But the Lord is faithful,.... Or "God" as the Vulgate Latin and Ethiopic versions read, as do also the Alexandrian and Claromontane copies. This is said for the comfort of the saints, lest they should be discouraged upon hearing that all professors of faith in Christ had it not, who might be ready to take it to themselves, and fear, that either they had it...
• Albert Barnes (Presbyterian), Barnes' New Testament Notes on 2 Thessalonians 3:3: Verse 3. But the Lord is faithful. Though men cannot be trusted, God is faithful to his promises and his purposes. He may always be confided in; and when men are unbelieving, perverse, unkind, and disposed to do us wrong, we may go to him, and we shall always find in him one in whom we may confide.