“And Ioshua had commanded the people, saying, Ye shall not shout, nor make any noise with your voice, neither shall any word proceed out of your mouth, vntill the day I bid you shoute, then shall ye shoute.”
1611 King James Version (KJV)
6:10 Ye shall not shout - Because shouting before the time appointed, would be ineffectual, and so might give them some discouragement, and their enemies matter of insulting.