John the Apostle
Revelation 3:12ESV·traditional attribution

The one who conquers, I will make him a pillar in the temple of my God. Never shall he go out of it, and I will write on him the name of my God, and the name of the city of my God, the new Jerusalem, which comes down from my God out of heaven, and my own new name.

Matthew Henry Presbyterian @wholebiblehenry

We have now come to the sixth letter, sent to one of the Asian churches, where observe, I. The inscription, showing, 1. For whom it was more immediately designed: The angel of the church of Philadelphia; this also was a city in Asia Minor, seated upon the borders of Mysia and Lydia, and had its name from that brotherly love for which it was eminent.

Commenting on Revelation 3:7-13

John Gill Reformed Baptist @doctorgill

He that hath an ear, let him hear,.... See Gill on Rev 2:7. . Revelation 3:14 rev 3:14 rev 3:14 rev 3:14And unto the angel of the church of the Laodiceans write,.... Of the city of Laodicea; see Gill on Rev 1:11; there was a church here in the times of the Apostle Paul; by whom it was founded is not known; mention is made...

Albert Barnes Presbyterian @notesbybarnes

Verse 12. Him that overcometh. . Will I make a pillar in the temple of my God. The promised reward of faithfulness here is, that he who was victorious would be honoured as if he were a pillar or column in the temple of God.