Proverbs 27:17 - Iron sharpens iron; so a man sharpens his friend's countenance.
1 Chronicles 29:2 - Now I have prepared with all my might for the house of my God the gold for the things of gold, and the silver for the things of silver, and the brass for the things of brass, the iron for the things of iron, and wood for the things of wood; onyx stones, and stones to be set, stones for inlaid work, and of various colors, and all kinds of precious stones, and marble stones in abundance.
1 Chronicles 22:3 - David prepared iron in abundance for the nails for the doors of the gates, and for the couplings; and brass in abundance without weight;
Micah 4:13 - Arise and thresh, daughter of Zion; for I will make your horn iron, and I will make your hoofs brass; and you will beat in pieces many peoples: and I will devote their gain to Yahweh, and their substance to the Lord of the whole earth.
2 Kings 6:6 - The man of God asked, "Where did it fall?" He showed him the place. He cut down a stick, threw it in there, and made the iron float.