John the Apostle
Revelation 4:2ESV·traditional attribution

At once I was in the Spirit, and behold, a throne stood in heaven, with one seated on the throne.

Matthew Henry Presbyterian @wholebiblehenry

We have here an account of a second vision with which the apostle John was favoured: After this, that is, not only "after I had seen the vision of Christ walking in the midst of the golden candlesticks," but "after I had taken his messages from his mouth, and written and sent them to the several churches, according to his command, after this I had...

Commenting on Revelation 4:1-7

John Gill Reformed Baptist @doctorgill

And immediately I was in the Spirit,.... As he had been before, Rev 1:10; it seems he had been some little time out of his ecstasy, how long cannot be said, and now, upon this new scene of things, returned to it; upon the opening of the door in heaven, and hearing the former voice, and the things it said, the Spirit of God at...

Albert Barnes Presbyterian @notesbybarnes

Verse 2. And immediately I was in the Spirit. . He does not affirm that he was caught up into heaven, nor does he say what impression was on his own mind, if any, as to the place where he was; but he was at once absorbed in the contemplation of the visions before him.