Joshua 6:2-6

Then the LORD said to Joshua, ‘See, I have delivered Jericho into your hands, along with its king and its fighting men. March round the city once with all the armed men. Do this for six days. Make seven priests carry trumpets of rams’ horns in front of the ark. On the seventh day, march round the city seven times, with the priests blowing the trumpets. When you hear them sound a long blast on the trumpets, make the whole army give a loud shout; then the wall of the city will collapse and the army will go up, everyone straight in.’ So Joshua son of Nun called the priests and said to them, ‘Take up the ark of the covenant of the LORD and make seven priests carry trumpets in front of it.’