John Calvin Reformed @genevareformer

The brevity of the inscription clearly shews that Paul’s doctrine had been received with reverence among the Thessalonians, and that without controversy they all rendered to him the honor that he deserved. For when in other Epistles he designates himself an Apostle, he does this for the purpose of claiming for himself authority.

Matthew Henry Presbyterian @wholebiblehenry

In this introduction we have, I. The inscription, where we have, 1. The persons from whom this epistle came, or by whom it was written. Paul was the inspired apostle and writer of this epistle, though he makes no mention of his apostleship, which was not doubted of by the Thessalonians, nor opposed by any false apostle among them.

John Gill Reformed Baptist @doctorgill

Paul, and Silvanus, and Timotheus,.... These are the persons concerned in this epistle, and who send their greetings and salutations to this church; Paul was the inspired writer of it, and who is called by his bare name, without any additional epithet to it, as elsewhere in his other epistles; where he is either styled the servant, or apostle, or prisoner of Christ, but here...