Numbers 10:7-9

Expanded Bible

⁷ When you want to gather the people, blow the trumpets, but don’t blow them as loudly.

⁸ “Aaron’s sons, the priests, should blow the trumpets. This is a ·law [perpetual/eternal regulation] for you and your descendants ·from now on [throughout your generations]. ⁹ When you are fighting an enemy who attacks you in your own land, blow the trumpets loudly. The Lord your God will ·take notice of [remember] you and will save you from your enemies.