Joshua 6:8-10 World English Bible (WEB)
8 It was so, that when Joshua had spoken to the people, the seven priests bearing the seven trumpets of rams’ horns before Yahweh advanced and blew the trumpets, and the ark of Yahweh’s covenant followed them. 9 The armed men went before the priests who blew the trumpets, and the ark went after them. The trumpets sounded as they went.
10 Joshua commanded the people, saying, “You shall not shout nor let your voice be heard, neither shall any word proceed out of your mouth until the day I tell you to shout. Then you shall shout.”