Numbers 10:1-5
The Blowing of Trumpets
10:1 The Lord spoke to Moses:
10:2 “Make two trumpets of silver; you are to make them from a single hammered piece. You will use them for assembling the community and for directing the traveling of the camps.
10:3 When they blow them both, all the community must come to you to the entrance of the tent of meeting.
10:4 “But if they blow with one trumpet, then the leaders, the heads of the thousands of Israel, must come to you.
10:5 When you blow an alarm, then the camps that are located on the east side must begin to travel.