Numbers 10:2-4

2‘Make two trumpets from one piece of silver. Use a hammer to make them in the right shape. Make a noise with them to tell the people that they must come together. Also, use the trumpets to tell the people that they must move the camp.

3When the people hear the sound from both trumpets, all the people must meet you. They must meet you at the door of the Tent of Meeting.

4But you may want only the leaders of Israel's tribes to meet you. If you want that, a priest should make the sound from only one trumpet.