Numbers 10:6

3 And when they shall blow with them, all the assembly shall assemble themselves to thee at the door of the tabernacle of the congregation.

4 And if they blow but with one trumpet, then the princes, which are heads of the thousands of Israel, shall gather themselves unto thee.

5 When ye blow an alarm, then the camps that lie on the east parts shall go forward.

6 When ye blow an alarm the second time, then the camps that lie on the south side shall take their journey: they shall blow an alarm for their journeys.

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

8 And the sons of Aaron, the priests, shall blow with the trumpets; and they shall be to you for an ordinance for ever throughout your generations.

9 And if ye go to war in your land against the enemy that oppresseth you, then ye shall blow an alarm with the trumpets; and ye shall be remembered before the LORD your God, and ye shall be saved from your enemies.