'Rod of Iron' in the Bible

Thou shalt bruise them with a rod of iron, and break them in pieces like a potter's vessel."

and he shall rule them with a rod of iron: and as the vessels of a potter, shall he break them to shivers. Even as I received of my father.

And she brought forth a man child, which should rule all nations with a rod of iron. And her son was taken up unto God, and to his seat.

and out of his mouth went out a sharp sword, that with it he should smite the heathen. And he shall rule them with a rod of iron, and he trod the wine-vat of fierceness and wrath of almighty God.