Numbers 10:2-4

Complete Jewish Bible

² “Make two trumpets; make them of hammered silver. Use them for summoning the community and for sounding the call to break camp and move on. ³ When they are sounded, the entire community is to assemble before you at the entrance to the tent of meeting. ⁴ If only one is sounded, then just the leaders, the heads of the clans of Isra’el, are to assemble before you.