Numbers 10:8

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.

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 10:9

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 31:6

Campaign Against the Midianites

31:6 So Moses sent them to the war, one thousand from every tribe, with Phinehas son of Eleazar the priest, who was in charge of the holy articles and the signal trumpets.

Numbers 10:10

10:10 “Also in the time when you rejoice, such as on your appointed festivals or at the beginnings of your months, you must blow with your trumpets over your burnt offerings and over the sacrifices of your peace offerings, so that they may become a memorial for you before your God: I am the Lord your God.”