Numbers 10:2-4

New International Version - UK

² ‘Make two trumpets of hammered silver, and use them for calling the community together and for the camps to set out. ³ When both are sounded, the whole community is to assemble before you at the entrance to the tent of meeting. ⁴ If only one is sounded, the leaders – the heads of the clans of Israel – are to assemble before you.