Numbers 10:3-8

³and they have blown with them, and all the company have met together unto thee, unto the opening of the tent of meeting.

⁴And if with one they blow, then have the princes, heads of the thousands of Israel, met together unto thee;

⁵'And ye have blown — a shout, and the camps which are encamping eastward have journeyed.

⁶'And ye have blown — a second shout, and the camps which are encamping southward have journeyed; a shout they blow for their journeys.

⁷'And in the assembling of the assembly ye blow, and do not shout;

⁸and sons of Aaron, the priests, blow with the trumpets; and they have been to you for a statute age-during to your generations.