Num Numbers, chapter Book of Numbers, chapter 10

When you2f blow an alarm, then the camps that lie on the east parts shall go forward.Num 2:3

When you2f blow an alarm the second time, then the camps that lie on the south side shall take their journey: they shall blow an alarm for their journeys.Num 2:10

But when the congregation is to be gathered together, you2f shall blow, but you2f shall not sound an alarm.