Joshua 6:4-6

4And seven priests shall carry before the ark seven blast-trumpets; and on the seventh day ye shall go round the city seven times, and the priests shall blow with the trumpets.

5And it shall come to pass when they make a long blast with the blast-horn, that all the people on hearing the sound of the trumpet shall shout with a great shout; and the wall of the city shall fall flat, and the people shall go up, each one straight before him.

6And Joshua the son of Nun called the priests, and said to them, Carry the ark of the covenant, and seven priests shall carry seven blast-trumpets before the ark of Jehovah.