Daniel 7:7 After this I saw in the night visions, and, behold, a fourth animal, awesome and powerful, and strong exceedingly; and it had great iron teeth; it devoured and broke in pieces, and stamped the residue with its feet: and it was diverse from all the animals that were before it; and it had ten horns. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)
Daniel 7:19 Then I desired to know the truth concerning the fourth animal, which was diverse from all of them, exceedingly terrible, whose teeth were of iron, and its nails of brass; which devoured, broke in pieces, and stamped the residue with its feet; (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)
Amos 1:3 Thus says Yahweh: "For three transgressions of Damascus, yes, for four, I will not turn away its punishment; because they have threshed Gilead with threshing instruments of iron; (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)
Micah 4:13 Arise and thresh, daughter of Zion; for I will make your horn iron, and I will make your hoofs brass; and you will beat in pieces many peoples: and I will devote their gain to Yahweh, and their substance to the Lord of the whole earth. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)