Numbers 10:3-5

New International Version

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^(A)—the heads of the clans of Israel—are to assemble before you. ⁵ When a trumpet blast is sounded, the tribes camping on the east are to set out.^(B)