Joshua 6:8-10

8After Joshua had spoken to the troops, seven priests carrying seven rams’ horns before the Lord moved forward and blew the rams’ horns; the ark of the Lord’s covenant followed them.

9While the rams’ horns were blowing, the armed men went in front of the priests who blew the rams’ horns, and the rear guard went behind the ark.

10But Joshua had commanded the troops, “Do not shout or let your voice be heard. Don’t let one word come out of your mouth until the time I say, ‘Shout! ’ Then you are to shout.”