John the Apostle
Revelation 2:10ESV·traditional attribution

Do not fear what you are about to suffer. Behold, the devil is about to throw some of you into prison, that you may be tested, and for ten days you will have tribulation. Be faithful unto death, and I will give you the crown of life.

Matthew Henry Presbyterian @wholebiblehenry

We now proceed to the second epistle sent to another of the Asian churches, where, as before, observe, I. The preface or inscription in both parts. 1. The superscription, telling us to whom it was more expressly and immediately directed: To the angel of the church in Smyrna, a place well known at this day by our merchants, a city of great trade and wealth...

Commenting on Revelation 2:8-11

John Gill Reformed Baptist @doctorgill

Fear none of those things which thou shalt suffer,.... God's people undergo sufferings of various sorts, as the Christians of those times did, scourgings, imprisonment, confiscation of goods, and death itself in various shapes; and these are certain, they shall suffer them; they are all known beforehand to Christ, and he sometimes gives his people previous notice of them, nor should they indulge a slavish fear about them.

Albert Barnes Presbyterian @notesbybarnes

Verse 10. Fear none of those things which thou shalt suffer. He did not promise them exemption from suffering. He saw that they were about to suffer, and he specifies the manner in which their affliction would occur. But he entreats and commands them not to be afraid.