Bible Verses About Brass or Copper: Hardness

Though I speak with the tongues of men and of angels, and have not charity, I am become as sounding brass, or a tinkling cymbal.

Because I knew that thou art obstinate, and thy neck is an iron sinew, and thy brow brass;

And Moses made a serpent of brass, and put it upon a pole, and it came to pass, that if a serpent had bitten any man, when he beheld the serpent of brass, he lived.

And the rest of the men which were not killed by these plagues yet repented not of the works of their hands, that they should not worship devils, and idols of gold, and silver, and brass, and stone, and of wood: which neither can see, nor hear, nor walk:

Thy shoes shall be iron and brass; and as thy days, so shall thy strength be.