'Rod of Iron' in the Bible

You shall break them with a rod of iron; you shall dash them in pieces like a potter's vessel.

And he shall rule them with a rod of iron; as the vessels of a potter shall they be broken to pieces: even as I received of my Father.

And she brought forth a male child, who was to rule all nations with a rod of iron: and her child was caught up unto God, and to his throne.

And out of his mouth goes forth a sharp sword, that with it he should smite the nations: and he shall rule them with a rod of iron: and he treads the winepress of the fierceness and wrath of Almighty God.