'Iron' in the Bible

And the house, when it was being built, was built of stone entirely made ready before it was brought thither; so that there was neither hammer nor axe nor any tool of iron heard in the house while it was being built.

(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 for himself horns of iron, and he said, Thus saith Jehovah: With these shalt thou push the Syrians, until thou have exterminated them.