Joshua 6:4-7

And seven priests shall bear seven trumpets of rams’ horns before the ark. But the seventh day you shall march around the city seven times, and the priests shall blow the trumpets. It shall come to pass, when they make a long blast with the ram’s horn, and when you hear the sound of the trumpet, that all the people shall shout with a great shout; then the wall of the city will fall down flat. And the people shall go up every man straight before him.” Then Joshua the son of Nun called the priests and said to them, “Take up the ark of the covenant, and let seven priests bear seven trumpets of rams’ horns before the ark of the LORD.” And he said to the people, “Proceed, and march around the city, and let him who is armed advance before the ark of the LORD.”