'Rod of Iron' in the Bible

And he will tend them with a rod of iron (they will be shattered like ceramic vessels), as I also have received from my Father.

And a sharp two-edged sword comes out of his mouth, so that he would smite the nations by it. And he will tend them with a rod of iron. And he treads the winepress of the wine of the wrath of the anger of the Almighty God.