John the Apostle
Revelation 5:7ESV·traditional attribution

And he went and took the scroll from the right hand of him who was seated on the throne.

Matthew Henry Presbyterian @wholebiblehenry

Here, I. The apostle beholds this book taken into the hands of the Lord Jesus Christ, in order to its being unsealed and opened by him. Here Christ is described, 1. By his place and station: In the midst of the throne, and of the four beasts, and of the elders.

Commenting on Revelation 5:6-14

John Gill Reformed Baptist @doctorgill

And he came,.... He drew nigh to the throne of God, he engaged his heart to approach unto him, and came up even to his seat, which a mere creature, without a Mediator, cannot do: and took the book out of the right hand of him that sat upon the throne; See Gill on Rev 5:1; it being given unto him, as in Rev 1:1...

Albert Barnes Presbyterian @notesbybarnes

Verse 7. And he came and took the book out of the right hand, etc. As if it pertained to him by virtue of rank or office. There is a difficulty here, arising from the incongruity of what is said of a lamb, which it is not easy to solve. The difficulty is in conceiving how a lamb could take the book from the hand of Him who held it.