'Iron' in the Bible

And with an iron pen and lead be cut into the rock for ever!

He may go in flight from the iron spear, but the arrow from the bow of brass will go through him;

Iron is taken out of the earth, and stone is changed into brass by the fire.

His bones are pipes of brass, his legs are like rods of iron.

Who has ever taken off his outer skin? who may come inside his inner coat of iron?

The sword may come near him but is not able to go through him; the spear, or the arrow, or the sharp-pointed iron.

Iron is to him as dry grass, and brass as soft wood.