'Iron' in the Bible

And the house, when it was in building, was built of stone made ready at the quarry; and there was neither hammer nor axe nor any tool of iron heard in the house, while it was in building.

(for they are thy people, and thine inheritance, which thou broughtest forth out of Egypt, from the midst of the furnace of iron);

And Zedekiah the son of Chenaanah made him horns of iron, and said, Thus saith Jehovah, With these shalt thou push the Syrians, until they be consumed.