“Yahweh spoke to Moses. ‘Make two silver trumpets. You shall make them of hammered work. You shall use them for summoning the congregation and for breaking camp. When both are blown, the whole congregation shall assemble before you at the entrance of the tent of meeting. But if one is blown, then the leaders, the heads of the tribes of Israel, shall assemble before you. When you blow an alarm, the camps that are on the east side shall set out. When you blow a second alarm, the camps on the south side shall set out. An alarm is to be blown whenever they are to set out. But when the assembly is to be gathered, you shall blow, but you shall not sound an alarm. The sons of Aaron, the priests, shall blow the trumpets. This shall be a perpetual institution for you throughout your generations. When you go to war in your land against the adversary who oppresses you, you shall sound an alarm with the trumpets, so that you may be remembered before Yahweh your God, and be saved from your enemies. Also on your days of rejoicing, at your appointed festivals, and at the beginnings of your months, you shall blow the trumpets over your burnt offerings and over your sacrifices of well being. They shall serve as a reminder before Yahweh your God. I am Yahweh your God.”
Yahweh spoke to Moses, telling him to make two silver trumpets. They had to use hammered silver to make these trumpets for summoning the congregation and for breaking camp. When both are blown, the whole congregation should assemble at the entrance of the tent of meeting. But if one is blown, then the leaders, the heads of the tribes of Israel, shall assemble. When the alarm blows, the camps on the east leave. When the second alarm blows, the camps on the south side leave. However, when the congregation is to be gathered together, they should only blow the trumpet, but not the alarm. Only the sons of Aaron, the priests, could blow the trumpets. This is a perpetual ordinance. However, when they were to go to war in the new land, they should blow an alarm with the trumpets to remember Yahweh. There are other times when they should blow the trumpets:
1) the days of rejoicing at appointed festivals;
2) the beginnings of months;
3) over burnt offerings;
4) and the sacrifices of well being.