'Iron' in the Bible

After they had passed the first and second guards, they came to the iron gate leading into the city. It opened for them by itself, and they went outside and walked down one narrow street, when at once the angel left him.

he will rule them with an iron rod and like clay jars he will break them to pieces,

They had breastplates like iron breastplates, and the sound of their wings was like the noise of many horse-drawn chariots charging into battle.

So the woman gave birth to a son, a male child, who is going to rule over all the nations with an iron rod. Her child was suddenly caught up to God and to his throne,

cargo such as gold, silver, precious stones, pearls, fine linen, purple cloth, silk, scarlet cloth, all sorts of things made of citron wood, all sorts of objects made of ivory, all sorts of things made of expensive wood, bronze, iron and marble,

From his mouth extends a sharp sword, so that with it he can strike the nations. He will rule them with an iron rod, and he stomps the winepress of the furious wrath of God, the All-Powerful.