Joshua 6:6-10

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

Then he said to the people, “Go forward and march around the city, and the armed men shall go on ahead of the ark of the Lord.”

And it was so, that when Joshua had spoken to the people, the seven priests carrying the seven trumpets of rams’ horns before the Lord went forward and blew the trumpets; and the ark of the covenant of the Lord followed them.

And the armed men went ahead of the priests who blew the trumpets, and the rear guard came after the ark, while they continued to blow the trumpets.

But Joshua commanded the people, saying, “You shall not shout nor let your voice be heard, nor let a word proceed from your mouth, until the day I tell you, ‘Shout!’ Then you shall shout!”