John the Apostle
Revelation 3:11BSB·traditional attribution

I am coming soon. Hold fast to what you have, so that no one will take your crown.

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 overcometh,.... In the hour of temptation, in this period of time; that stands his ground then, sustains the shock of the beast, with courage and intrepidity, and overcomes him: will I make a pillar in the temple of my God; by which is meant not the church triumphant, though such will have a place, and an abiding one there; but the church militant...

Albert Barnes Presbyterian @notesbybarnes

Verse 11. Behold, I come quickly. That is, in the trials referred to. , , . Hold that fast which thou hast. That is, whatever of truth and piety you now possess. . That no man take thy crown. The crown of life appointed for all who are true believers. .