'Iron' in the Bible

And he brought out the people that were in it, and put them under the saw, and under harrows of iron, and under axes of iron, and made them pass through the brickkilns. And so did he to all the cities of the children of Ammon. And David and all the people returned to Jerusalem.

And the man that will touch them provideth himself with iron and the staff of a spear; And they shall be utterly burned with fire in their place.