Numbers 10:7-9 Tree of Life Version (TLV)
7 To gather the whole national community, you are to sound the sustained blasts, but not the short blasts. 8 The sons of Aaron will blow the trumpets. This is to be an eternal ordinance for you as well as for your generations to come.
9 Whenever you go to war in your own land against the enemy who is hostile to you, you are to sound short blasts of alarm. Then you will be remembered before Adonai your God and be delivered from your enemies.