John the Apostle
Revelation 10:4ESV·traditional attribution

And when the seven thunders had sounded, I was about to write, but I heard a voice from heaven saying, “Seal up what the seven thunders have said, and do not write it down.”

Matthew Henry Presbyterian @wholebiblehenry

Here we have an account of another vision the apostle was favoured with, between the sounding of the sixth trumpet and that of the seventh. And we observe, I. The person who was principally concerned in communicating this discovery to John - an angel from heaven, another mighty angel, who is so set forth as would induce one to think it could be no other...

Commenting on Revelation 10:1-7

John Gill Reformed Baptist @doctorgill

And when the seven thunders had uttered their voices,.... Or declared all they had to denounce upon the enemies of Christ and his church: I was about to write; John taking particular notice of what they said, and believing it might be for the advantage, comfort, and support of the church of Christ under its suffering circumstances, to be informed of what God had in...

Albert Barnes Presbyterian @notesbybarnes

Verse 4. And when the seven thunders had uttered their voices. After he had listened to those thunders; or when they had passed by. I was about to write. That is, he was about to record what was uttered, supposing that that was the design for which he had been made to hear them.