Joshua 6:4-6

4Have seven priests carry seven ram’s-horn trumpets in front of the ark. But on the seventh day, march around the city seven times, while the priests blow the rams’ horns.

5When there is a prolonged blast of the horn and you hear its sound, have all the troops give a mighty shout. Then the city wall will collapse, and the troops will advance, each man straight ahead.”

6So Joshua son of Nun summoned the priests and said to them, “Take up the ark of the covenant and have seven priests carry seven rams’ horns in front of the ark of the Lord.”