Numbers 10:9-10

⁹And if you° shall go forth to war in your land against your enemies that are opposed to you, then shall you° sound with the trumpets; and you° shall be had in remembrance before the Lord, and you° shall be saved from your enemies.

¹⁰And in the days of your gladness, and in your feasts, and in your new moons, you° shall sound with the trumpets at your whole burnt offerings, and at the sacrifices of your peace-offerings; and there shall be a memorial for you before your God: I am the Lord your God.