Joshua 6:4-5 NIV

4 Have seven priests carry trumpets of rams' horns1 in front of the ark. On the seventh day, march around the city seven times, with the priests blowing the trumpets.2

References for Joshua 6:4

5 When you hear them sound a long blast3 on the trumpets, have all the people give a loud shout;4 then the wall of the city will collapse and the people will go up, every man straight in."

References for Joshua 6:5