Daniel 4:25 (BSB)

You will be driven away from mankind, and your dwelling will be with the beasts of the field. You will feed on grass like an ox and be drenched with the dew of heaven, and seven times shall pass you by, until you acknowledge that the Most High rules over the kingdom of mankind and gives it to whom He wishes.

From Daniel 4. Also in the ESV.

Commentary on Daniel 4:25

• John Calvin (Reformed), Calvin's Commentaries on Daniel 4:25: Daniel proceeds with the explanation of the king’s dream, to whom the last verse which I explained yesterday applies. This ought to be expressed, because this message was sorrowful and bitter for the king. We know how indignantly kings are usually compelled not only to submit to orders, but even to be cited before God’s tribunal, where they must be overwhelmed in shame and disgrace.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Daniel 4:19-27: We have here the interpretation of Nebuchadnezzar's dream; and when once it is applied to himself, and it is declared that he is the tree in the dream (Mutato nomine de te fabula narratur - Change but the name, the fable speaks of thee), when once it is said, Thou art the man, there needs little more to be said for the explication of the dream.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Daniel 4:25: Wherefore, O king, let my counsel be acceptable to thee,.... Since this is the true interpretation of the dream, and such evils are like to befall thee according to it, permit me, though thou art a king, and I am thy minister or servant, to give thee some advice; and let it be taken in good part, as done with a good design, and a...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Daniel 4:25: they shall drive thee--a Chaldee idiom for "thou shalt be driven." Hypochondriacal madness was his malady, which "drove" him under the fancy that he was a beast, to "dwell with the beasts"; Dan 4:34 proves this, "mine understanding returned." The regency would leave him to roam in the large beast-abounding parks attached to the palace. eat grass--that is, vegetables, or herbs in general (Gen 3:18).