Numbers 10:4-6

Revised Standard Version

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