2 Thessalonians 2:1

From these words it appears that some among the Thessalonians had mistaken the apostle's meaning, in what he had written in his former epistle about the coming of Christ, by thinking that it was near at hand, - that Christ was just ready to appear and come to judgment. Or, it may be, some among them pretended that they had the knowledge of this by particular revelation from the Spirit, or from some words they had heard from the apostle, when he was with them, or some letter he had written or they pretended he had written to them or some other person: and hereupon the apostle is careful to rectify this mistake, and to prevent the spreading of this error. Observe, If errors and mistakes arise among Christians, we should take the first opportunity to rectify them, and hinder the spreading thereof; and good men will be especially careful to suppress errors that may arise from a mistake of their words and actions, though that which was spoken or done was ever so innocent or well. We have a subtle adversary, who watches all opportunities to do mischief, and will sometimes promote errors even by means of the words of scripture. Observe, I. How very earnest and solicitous this apostle was to prevent mistakes: We beseech you, brethren, etc., Th2 2:1. He entreats them as brethren who might have charged them as a father charges his children: he shows great kindness and condescension, and insinuates himself into their affections.

— Matthew Henry's Concise Commentary (public domain)