John the Apostle
Revelation 15:8BSB·traditional attribution

And the temple was filled with smoke from the glory of God and from His power; and no one could enter the temple until the seven plagues of the seven angels were completed.

Matthew Henry Presbyterian @wholebiblehenry

Observe, I. How these angels appeared - coming out of heaven to execute their commission: The temple of the tabernacle of the testimony in heaven was opened, Rev 15:5. Here is an allusion to the holiest of all the tabernacle and temple, where was the mercy-seat, covering the ark of the testimony, where the high priest made intercession, and God communed with his people, and heard their prayers.

Commenting on Revelation 15:5-8

John Gill Reformed Baptist @doctorgill

And the temple was filled with smoke,.... Not with the smoke of false doctrine and superstition; that comes out of the bottomless pit, this from God, Rev 9:2 and besides, Gospel churches will grow purer and purer, while the seven angels are pouring out the vials: but rather this may be understood of judicial blindness and hardness of heart, upon the antichristian party, which will...

Albert Barnes Presbyterian @notesbybarnes

Verse 8. And the temple was filled with smoke. The usual symbol of the Divine presence in the temple. . From the glory of God. From the manifestation of the Divine Majesty. That is, the smoke was the proper accompaniment of the Divine Being when appearing in majesty.