1 Chronicles 22:16 - Joseph Benson’s Commentary on the Old and New Testaments

Of the brass and the iron there is no number The meaning is, the quantity of brass and iron was not numbered, as that of the gold and silver was. Arise, therefore, and be doing When thou shalt come to the throne. The sense of God's presence must not slacken our endeavours; because he is with us, we must rise and be doing. Then he will be with us even to the end. Work out your salvation, and God will work in you.