Numbers 10:4-6

New Revised Standard Version, Anglicised Catholic Edition

⁴ But if only one is blown, then the leaders, the heads of the tribes of Israel, shall assemble before you. ⁵ When you blow an alarm, the camps on the east side shall set out; ⁶ when you blow a second alarm, the camps on the south side shall set out. An alarm is to be blown whenever they are to set out.