Bamidbar 10:7-9

Orthodox Jewish Bible

⁷ But when the Kahal is to be gathered together, ye shall sound it, but ye shall not sound a teruah.

⁸ And the Bnei Aharon, the kohanim, shall sound the tzotzerot; and they shall be to you for a chukkat olam throughout your dorot.

⁹ And if ye go into milchamah (battle) in your land against the enemy that oppresseth you, then ye shall sound a blast on the tzotzerot; and ye shall be remembered before Hashem Eloheichem, and ye shall be saved from your enemies.