Joshua 6:4-8

4And seven priests shall bear before the ark seven trumpets of rams’ horns: and the seventh day ye shall march around the city seven times, and the priests shall blow with the trumpets. 5And it shall come to pass, that when they make a long blast with the ram’s horn, and when ye hear the sound of the trumpet, all the people shall shout with a great shout; and the wall of the city shall fall down flat, and the people shall go up every man straight before him.1

6And 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. 7And he said to the people, Pass on, and march around the city, and let him that is armed pass on before the ark of the LORD. 8And it came to pass, when Joshua had spoken to the people, that the seven priests bearing the seven trumpets of rams’ horns passed on before the LORD, and blew with the trumpets: and the ark of the covenant of the LORD followed them.