Numbers 10:8-10

Complete Jewish Bible

⁸ It will be the sons of Aharon, the cohanim, who are to sound the trumpets; this will be a permanent regulation for you through all your generations.

⁹ “When you go to war in your land against an adversary who is oppressing you, you are to sound an alarm with the trumpets; then you will be remembered before Adonai your God, and you will be saved from your enemies.

¹⁰ “Also on your days of rejoicing, at your designated times and on Rosh-Hodesh, you are to sound the trumpets over your burnt offerings and over the sacrifices of your peace offerings; these will be your reminder before your God. I am Adonai your God.”