Daniel 4:13 (BSB)

As I lay on my bed, I also saw in the visions of my mind a watcher, a holy one, coming down from heaven.

From Daniel 4. Also in the ESV.

Commentary on Daniel 4:13

• John Calvin (Reformed), Calvin's Commentaries on Daniel 4:13: The second part of the dream follows here. Hitherto Nebuchadnezzar has described the beauty and excellency of his state under the figure of a lofty tree which afforded shade to the beasts and on whose fruit they fed, and next as giving, nests to the birds of heaven under its boughs. The cutting down of the tree now follows.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Daniel 4:4-18: Nebuchadnezzar, before he relates the judgments of God that had been wrought upon him for his pride, gives an account of the fair warning he had of them before they came, a due regard to which might have prevented them.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Daniel 4:13: I saw in the visions of my head upon my bed,.... The king goes on to relate what other things presented themselves to his imagination in his dream, concerning this tree which signified himself: and, behold, a watcher: which Saadiah interprets of Bath Kol; but Aben Ezra, Jarchi, Jacchiades, and Ben Melech of an angel; so called because incorporeal, ever watches, and never sleeps, and...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Daniel 4:13: watcher and an holy one--rather, "even an holy one." Only one angel is intended, and he not one of the bad, but of the holy angels. Called a "watcher," because ever on the watch to execute God's will [JEROME], (Psa 103:20-21). Compare as to their watchfulness, Rev 4:8, "full of eyes within . . .