'Iron' in the Bible

And he took the people out of the town and put them to work with wood-cutting instruments, and iron grain-crushers, and iron axes, and at brick-making: this he did to all the towns of the children of Ammon. Then David and all the people went back to Jerusalem.

But anyone touching them has to be armed with iron and the rod of a spear; and they will be burned with fire, every one of them.