Numbers 10:3-7

³When they blow them, all the congregation shall gather themselves to you at the door of the Tent of Meeting.

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

⁵When you blow an alarm, the camps that lie on the east side shall go forward.

⁶When you blow an alarm the second time, the camps that lie on the south side shall go forward. They shall blow an alarm for their journeys.

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