Joshua 6:2

Now Jericho was straitly shut up because of the children of Israel: none went out, and none came in.

And ye shall compass the city, all ye men of war, and go round about the city once. Thus shalt thou do six days.

And seven priests shall bear before the ark seven trumpets of rams' horns: and the seventh day ye shall compass the city seven times, and the priests shall blow with the trumpets.

And 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 ascend up every man straight before him.