Joshua 6:4-6

4Seven kohanim will carry seven shofarot of rams’ horns before the ark. Then on the seventh day you are to circle the city seven times while the kohanim blow the shofarot.

5It will be when they make a long blast with the ram’s horn, when you hear the sound of the shofar, have all the people shout a loud shout—then the wall of the city will fall down flat, and the people will go up, everyone straight ahead.”

6So Joshua son of Nun summoned the kohanim and said to them, “Take up the ark of the covenant. Let seven kohanim carry seven shofarot of rams’ horns before the ark of Adonai.”