Numbers 10:4-6

American Standard Version

⁴ And if they blow but one, then the princes, the heads of the thousands of Israel, shall gather themselves unto thee. ⁵ And when ye blow an alarm, the camps that lie on the east side shall take their journey. ⁶ And when ye blow an alarm the second time, the camps that lie on the south side shall take their journey: they shall blow an alarm for their journeys.