Num Numbers, chapter Book of Numbers, chapter 10
And the Bnei Aharon, the kohanim, shall sound the khatzotzerot; and they shall be to you for a chukkat olam throughout your dorot. Exo 27:21
And the Bnei Aharon, the kohanim, shall sound the khatzotzerot; and they shall be to you for a chukkat olam throughout your dorot. Exo 27:21