Numbers 10:8

5 But if the sound of the trumpets be longer, and with interruptions, they that are on the east side, shall first go forward.

6 And at the second sounding and like noise of the trumpet, they who lie on the south side shall take up their tents. And after this manner shall the rest do, when the trumpets shall sound for a march.

7 But when the people is to be gathered together, the sound of the trumpets shall be plain, and they shall not make a broken sound.

8 And the sons of Aaron the priest shall sound the trumpets: and this shall be an ordinance for ever in your generations.

9 If you go forth to war out of your land against the enemies that fight against you, you shall sound aloud with the trumpets, and there shall be a remembrance of you before the Lord your God, that you may be delivered out of the hands of your enemies.

10 If at any time you shall have a banquet, and on your festival days, and on the first days of your months, you shall sound the trumpets over the holocausts, and the sacrifices of peace offerings, that they may be to you for a remembrance of your God. I am the Lord your God.

11 The second year, in the second month, the twentieth day of the month, the cloud was taken up from the tabernacle of the covenant.