The Apostle Paul
2 Thessalonians 3:18ESV·traditional attribution

The grace of our Lord Jesus Christ be with you all.

Matthew Henry Presbyterian @wholebiblehenry

In this conclusion of the epistle we have the apostle's benediction and prayers for these Thessalonians. Let us desire them for ourselves and our friend. There are three blessings pronounced upon them, or desired for them: - I. That God would give them peace. Note, 1. Peace is the blessing pronounced or desired.

Commenting on 2 Thessalonians 3:16-18

John Gill Reformed Baptist @doctorgill

The grace of our Lord Jesus Christ be with you all. Amen. This was the sign or token; See Gill on Rom 16:20 The subscription to this epistle is, "The Second Epistle to the Thessalonians was written from Athens"; though it seems rather to be written from Corinth.

Albert Barnes Presbyterian @notesbybarnes

Verse 18. The grace of our Lord Jesus Christ be with you all. . From the subscription to this epistle, it purports to have been "written from Athens." This is probably incorrect, as there is reason to think that it was written from Corinth. See the Introduction. At all events, this subscription is of no authority. See Notes at the end of the Epistles to the Romans and 1 Corinthians.