Joshua 6
4 Ref And let seven priests go before the ark with seven loud-sounding horns in their hands: on the seventh day you are to go round the town seven times, the priests blowing their horns.
5 Ref And at the sound of a long note on the horns, let all the people give a loud cry; and the wall of the town will come down flat, and all the people are to go straight forward.
6 Ref Then Joshua, the son of Nun, sent for the priests and said to them, Take up the ark of the agreement, and let seven priests take seven horns in their hands and go before the ark of the Lord.