'Iron' in the Bible
As for all the hills that used to be cultivated with a hoe, you won't go there, because you'll fear iron briars and thorns. Nevertheless, those hills will be reserved as a pasture where cattle will feed and where sheep will graze."
And he shall cut down the thickets of the forest with iron, and Lebanon shall fall by a mighty one.
So the metal-worker put heart into the gold-worker, and he who was hammering the metal smooth said kind words to the iron-worker, saying of the plate, It is ready: and he put it together with nails, so that there might be no slipping.
He hath wrought iron with an axe, And hath wrought with coals, And with hammers doth form it, And doth work it by his powerful arm, Yea, he is hungry, and there is no power, He doth not drink water, and he is wearied.
I will go before thee, and make the crooked places straight: I will break in pieces the gates of brass, and cut in sunder the bars of iron:
Because I knew that thou art obstinate, and thy neck is an iron sinew, and thy brow brass;
Shake off the dirt! Get up, captive Jerusalem! Take off the iron chains around your neck, O captive daughter Zion!
See, I have made the iron-worker, blowing on the burning coals, and making the instrument of war by his work; and I have made the waster for destruction.