Numbers 10:7-9 Living Bible (TLB)
5-7 “Different trumpet blasts will be necessary to distinguish between the summons to assemble and the signal to break camp and move onward.[a] When the travel signal is blown, the tribes camped on the east side of the Tabernacle shall leave first; at the second signal, the tribes on the south shall go. 8 Only the priests are permitted to blow the trumpets. This is a permanent instruction to be followed from generation to generation.
9 “When you arrive in the Promised Land and go to war against your enemies, God will hear you and save you from your enemies when you sound the alarm with these trumpets.