Numbers 10:2-10

2“Make two trumpets of hammered silver for yourself. They are for summoning the community and having the camps set out.

3Whenever both are sounded, the whole community is to gather toward you at the entrance of the Tent of Meeting.

4But if only one is sounded, the princes—the heads of the tribes of Israel—are to gather toward you.

5When you sound the trumpet the first time, the camp of those camped on the east is to set out.

6When you sound the trumpet blast the second time, the camp of those camped on the south is to set out. Short blasts will be the signal for their moving out.

7To gather the whole national community, you are to sound the sustained blasts, but not the short blasts.

8The sons of Aaron, the kohanim will blow the trumpets. This is to be an eternal ordinance for you as well as for your generations to come.

9Whenever you go to war in your own land against the enemy who is hostile to you, you are to sound short blasts of alarm. Then you will be remembered before Adonai your God and be delivered from your enemies.

10Also at your days of rejoicing, feasts and new moons, you are to blow on the trumpets over your burnt offerings and fellowship offerings. They will then be a reminder for you before Adonai your God. I am Adonai your God!”