Numbers 10:1-10

The LORD spoke further to Moses, saying, “Make two trumpets of silver; you shall make them of hammered work. You shall use them to summon the congregation and to have the camps move out. When both are blown, all the congregation [that is, all adult males] shall gather before you at the doorway of the Tent of Meeting (tabernacle). However, if a single trumpet is blown, then the leaders, heads of the tribes of Israel, shall gather themselves to you. When you blow an alarm, the camps on the east side [of the tabernacle] shall set out. When you blow an alarm the second time, then the camps on the south side [of the tabernacle] shall set out. They shall blow an alarm whenever they are to move out [on their journeys]. When the assembly is to be gathered, you shall blow [the trumpets in short, sharp tones], but without sounding an alarm. The sons of Aaron, the priests, shall blow the trumpets; and the trumpets shall be for you a perpetual statute throughout your generations. When you go to war in your land against the enemy that attacks you, then sound an alarm with the trumpets, so that you may be remembered before the LORD your God, and you shall be saved from your enemies. Also in the day of rejoicing, and in your appointed feasts, and at the beginnings of your months, you shall sound the trumpets over your burnt offerings, and over the sacrifice of your peace offerings; and they shall be as a reminder of you before your God. I am the LORD your God.”