Joshua 6:2-5

²And the LORD said to Joshua, "See, I have given into your hand Jericho, with its king and mighty men of valor. ³You shall march around the city, all the men of war going around the city once. Thus shall you do for six days. ⁴And seven priests shall bear seven trumpets of rams' horns before the ark; and on the seventh day you shall march around the city seven times, the priests blowing the trumpets. ⁵And when they make a long blast with the ram's horn, as soon as you hear the sound of the trumpet, then all the people shall shout with a great shout; and the wall of the city will fall down flat, and the people shall go up every man straight before him."