Numbers 10:4-6

New International Version

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) 6} At the sounding of a second blast, the camps on the south are to set out.^(C) The blast will be the signal for setting out.