Numbers 10:8-10

“The sons of Aaron, the priests, are in charge of blowing the bugles; it’s their assigned duty down through the generations. When you go to war against an aggressor, blow a long blast on the bugle so that GOD will notice you and deliver you from your enemies. Also at times of celebration, at the appointed feasts and New Moon festivals, blow the bugles over your Whole-Burnt-Offerings and Peace-Offerings: they will keep your attention on God. I am GOD, your God.”