Derek Prince - Sermon: The Rod Of God In Your Hands.
The rod in the Bible was the emblem of a ruler. It's a mark of his authority. Aaron’s authority was challenged. So the twelve rods were laid in the holy of holiest. The twelfth rod (Aaron's rod) blossomed (type of the resurrection).
Bible teacher Derek Prince also retells te story of Moses and how his rod became a snake as a sign to the farao.
So the rod has the name of the ruler is on it (Num. 17:2). The authority is in the name. We've been giving authority by Jesus. We've been given the rod of God.