Joshua 6:2-5

And the Lord said to Joshua, See, I have given Jericho, its king and mighty men of valor, into your hands. You shall march around the enclosure, all the men of war going around the city once. This you shall do for six days. And seven priests shall bear before the ark seven trumpets of rams' horns; and on the seventh day you shall march around the enclosure seven times, and the priests shall blow the trumpets. When they make a long blast with the ram's horn and you hear the sound of the trumpet, all the people shall shout with a great shout; and the wall of the enclosure shall fall down in its place and the people shall go up [over it], every man straight before him.