Daniel 7:19 (BSB)

Then I wanted to know the true meaning of the fourth beast, which was different from all the others—extremely terrifying—devouring and crushing with iron teeth and bronze claws, then trampling underfoot whatever was left.

From Daniel 7. Also in the ESV.

Commentary on Daniel 7:19

• John Calvin (Reformed), Calvin's Commentaries on Daniel 7:19: Here the Prophet interrogates the angel concerning the Fourth Beast more attentively and carefully; as we formerly saw him touched with greater admiration on beholding the beast which was formidable beyond the other three, so that neither a name nor representation could be found for it.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Daniel 7:15-28: Here we have, I. The deep impressions which these visions made upon the prophet. God in them put honour upon him, and gave him satisfaction, yet not without a great allay of pain and perplexity (Dan 7:15): I Daniel was grieved in my spirit, in the midst of my body.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Daniel 7:19: Then I would know the truth of the fourth beast;.... What it represented, what kingdom or monarchy was meant by it; for, by the above answer of the angel, he understood the four beasts signified four kings or kingdoms; the three first he pretty well understood; at least he was not so solicitous about them as about the fourth; and this he was desirous of...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Daniel 7:19: Balaam, an Aramean, dwelling on the Euphrates, at the beginning of Israel's independent history, and Daniel at the close of it, prophetically exhibit to the hostile world powers Israel as triumphant over them at last, though the world powers of the East (Asshur) and the West (Chittim) carry all before them and afflict Eber (Israel) for a time (Num 23:8-10, Num 23:28; Num 24:2, Num 24:7-9, Num 24:22-24).