Numbers 10:8-9

10:8 The sons of Aaron, the priests, must blow the trumpets; and they will be to you for an eternal ordinance throughout your generations. 10:9 If you go to war in your land against an adversary who opposes you, then you must sound an alarm with the trumpets, and you will be remembered before the Lord your God, and you will be saved from your enemies.

Numbers 10:2

10:2 “Make two trumpets of silver; you are to make them from a single hammered piece. You will use them for assembling the community and for directing the traveling of the camps.

Numbers 13:12-15

13:12 from the tribe of Dan, Ammiel son of Gemalli; 13:13 from the tribe of Asher, Sethur son of Michael; 13:14 from the tribe of Naphtali, Nahbi son of Vopshi; 13:15 from the tribe of Gad, Geuel son of Maki.