John the Apostle
Revelation 5:5BSB·traditional attribution

Then one of the elders said to me, “Do not weep! Behold, the Lion of the tribe of Judah, the Root of David, has triumphed to open the scroll and its seven seals.”

Matthew Henry Presbyterian @wholebiblehenry

Hitherto the apostle had seen only the great God, the governor of all things, now, I. He is favoured with a sight of the model and methods of his government, as they are all written down in a book which he holds in his hand; and this we are now to consider as shut up and sealed in the hand of God. Observe, 1.

Commenting on Revelation 5:1-5

John Gill Reformed Baptist @doctorgill

And one of the elders said unto me,.... The Ethiopic version reads, "one of these elders"; that is, one of the four and twenty elders that were round about the throne; not the first of the four and twenty books of the Old Testament; nor the patriarch Jacob, because of the prophecy concerning Shiloh, Judah's son, which stands in Gen 49:10, nor Moses, who spoke...

Albert Barnes Presbyterian @notesbybarnes

Verse 5. And one of the elders saith unto me. . No particular reason is assigned why this message was delivered by one of the elders rather than by an angel. If the elders were, however, () the representatives of the church, there was a propriety that they should address John in his trouble.