Numbers 10:1-9

ISV^{(i) 1} Silver TrumpetsThe LORD also told Moses, ² “Make two trumpets, crafting them from beaten silver, for use in calling the congregation together and for notifying the camps to set out for travel. ³ Sound them when the whole assembly is to gather together at the entrance to the appointed place of meeting. ⁴ When one trumpet is blown, the elders and the heads of the thousands of the Israelis are to gather to you. ⁵ When you sound an alarm, the ones encamped on the east side are to begin to travel. ⁶ When you sound the alarm the second time, those encamped on the south are to begin to travel. Alarms are to be sounded for their travels. ⁷ But when you blow the trumpet to assemble the whole congregation, don’t use the same sound as you do for sounding an alarm. ⁸ The descendants of Aaron the priest are to blow the trumpets. Have them do this for you permanently throughout your generations to come.”
⁹ Sounding the Trumpet in Battle“When you wage war in your land against an enemy who is hostile to you, you are to sound an alarm with the trumpets. Then you will be remembered before the face of the LORD your God and you will be delivered from your enemies.