Numbers 10:6 WEB

⁴  If they blow but one, then the princes, the heads of the thousands of Israel, shall gather themselves to you.

⁵  When you blow an alarm, the camps that lie on the east side shall take their journey.

⁶  When you 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.

⁷  But when the assembly is to be gathered together, you shall blow, but you shall not sound an alarm.

⁸  The sons of Aaron, the priests, shall blow the trumpets; and they shall be to you for a statute forever throughout your generations.