Joshua 6:4-5

Have seven priests carry trumpets made from horns of male sheep and have them march in front of the Ark. On the seventh day march around the city seven times and have the priests blow the trumpets as they march. They will make one long blast on the trumpets. When you hear that sound, have all the people give a loud shout. Then the walls of the city will fall so the people can go straight into the city.”