God sends His Prophets with clear proofs indicating their prophet hood, the book [which contains all the teachings required for the guidance of man] and the criterion without which right or wrong can not be defined. God has also sent down the iron which gives you great strength [to be used by God’s army to enforce His Will] and has many other benefits for man. All this is done so that God may know who helps His cause and His Prophets, on faith. God is strong [and does not need your help], Almighty.