John the Apostle
Revelation 2:1BSB·traditional attribution

“To the angel of the church in Ephesus write: These are the words of Him who holds the seven stars in His right hand and walks among the seven golden lampstands.

Matthew Henry Presbyterian @wholebiblehenry

We have here, I. The inscription, where observe, 1. To whom the first of these epistles is directed: To the church of Ephesus, a famous church planted by the apostle Paul (Acts 19), and afterwards watered and governed by John, who had his residence very much there.

Commenting on Revelation 2:1-7

John Gill Reformed Baptist @doctorgill

Unto the angel of the church of Ephesus write,.... Of the city of Ephesus; see Gill on Rev 1:11 and see Gill on Act 18:19. The church here seems to have been founded by the Apostle Paul, who continued here two years, by which means all Asia heard the word of the Lord Jesus, Act 19:10; of this church; see Gill on Act 20:17; it...

Albert Barnes Presbyterian @notesbybarnes

CHAPTER II ANALYSIS OF THE CHAPTER This chapter comprises four of the seven epistles addressed to the seven churches: those addressed to Ephesus, Smyrna, Pergamos, and Thyatira. A particular view of the contents of the epistles will be more appropriate as they come separately to be considered, than in this place. There are some general remarks in regard to their structure, however, which may be properly made here.