EXO 17:9

9 And Moses said to Joshua, Choose thou men, and go out, and fight tomorrow against the men of Amalek; lo! I shall stand in the top of the hill, and I shall have the rod of God in mine hand. (And Moses said to Joshua, Choose thou some men, and tomorrow go out, and fight against the Amalekites; behold! I shall stand on the hilltop, and I shall have God’s staff in my hand.)