Numbers 10:2-4

New Revised Standard Version, Anglicised Catholic Edition

² Make two silver trumpets; you shall make them of hammered work; and you shall use them for summoning the congregation, and for breaking camp. ³ When both are blown, the whole congregation shall assemble before you at the entrance of the tent of meeting. ⁴ But if only one is blown, then the leaders, the heads of the tribes of Israel, shall assemble before you.