Numbers 31:6

And Moses sent them to the war, as a holy army under the direction of Jehovah, and very likely with Joshua as their commander, a thousand of every tribe, them and Phinehas, the son of Eleazar, the priest, who had distinguished himself in his zeal for the Lord, to the war with the holy instruments, either the priestly garments or some of the consecrated vessels, and the trumpets to blow in his hand, for that was one of the objects of the silver trumpets, to call the army to battle, Numbers 10:9.