Joshua 6:8-10

8So it was, when Joshua had spoken to the people, that the seven priests bearing the seven trumpets of rams’ horns before the Lord advanced and blew the trumpets, and the ark of the covenant of the Lord followed them.

9The armed men went before the priests who blew the trumpets, and the rear guard came after the ark, while the priests continued blowing the trumpets.

10Now Joshua had commanded the people, saying, “You shall not shout or make any noise with your voice, nor shall a word proceed out of your mouth, until the day I say to you, ‘Shout!’ Then you shall shout.”