Numbers 10:7-9 New Life Version (NLV)
7 But when the people are to be gathered together, you will blow the horn without the sound of danger. 8 Aaron’s sons, the religious leaders, will blow the horns. This will be a Law for all your people forever. 9 When you go to war in your land against those who fight you, then sound the horns to tell of war. That way you will be remembered before the Lord your God, and be saved from those who hate you.