Numbers 10:3-8

³And thou shalt sound with them, and all the congregation shall be gathered to the door of the tabernacle of witness.

⁴And if they shall sound with one, all the rulers even the princes of Israel shall come to thee.

⁵And ye shall sound an alarm, and the camps pitched eastward shall begin to move.

⁶And ye shall sound a second alarm, and the camps pitched southward shall move; and ye shall sound a third alarm, and the camps pitched westward shall move forward; and ye shall sound a fourth alarm, and they that encamp toward the north shall move forward: they shall sound an alarm at their departure.

⁷And whenever ye shall gather the assembly, ye shall sound, but not an alarm.

⁸And the priests the sons of Aaron shall sound with the trumpets; and it shall be a perpetual ordinance for you throughout your generations.