Joshua 6:4-6

4Seven priests will carry rams’ horns ahead of the ark. But on the seventh day you must march around the city seven times while the priests blow their horns.

5When you hear a long blast on the horn, all the troops must shout very loudly. The wall around the city will collapse. Then the troops must charge straight ahead into the city.”

6Joshua, son of Nun, summoned the priests. He said to them, “Pick up the ark of the promise, and have seven priests carry seven rams’ horns ahead of the Lord’s ark.”