Numbers 3:17 And these were the sons of Levi by their names: Gershon and Kohath and Merari.
Num 3:25-26 And the guard duty of the sons of Gershon in the tent of meeting involved the tabernacle, the tent with its covering, the screen for the entrance of the tent of meeting, the hangings of the court, the screen for the door of the court that is around the tabernacle and the altar, and its cords—all the service connected with these.
Num 3:29 The clans of the sons of Kohath were to camp on the south side of the tabernacle, with Elizaphan the son of Uzziel as chief of the fathers’ house of the clans of the Kohathites. And their guard duty involved the ark, the table, the lampstand, the altars, the vessels of the sanctuary with which the priests minister, and the screen; all the service connected with these.
Num 3:36 And the appointed guard duty of the sons of Merari involved the frames of the tabernacle, the bars, the pillars, the bases, and all their accessories; all the service connected with these; also the pillars around the court, with their bases and pegs and cords.
The Levites were in three classes, according to the sons of Levi; Gershon, Kohath, and Merari; and these were subdivided into families. The posterity of Moses were not at all honoured or privileged, but stood upon the level with other Levites; thus it was plain, that Moses did not seek the advancement of his own family, or to secure any honours to it. The tribe of Levi was by much the least of all the tribes. God’s chosen are but a little flock in comparison with the world. (Henry)
Having been called into service and assigned to things of God over the Tabernacle, the Levites took their place, not as preparing for war but rather for ministering for and of the things of God.
There is a holy honor and blessing in service to God and the things of God. Being a child of God, chosen, and called, we will do well to camp our hearts and minds in ready service to the work He directs us to do.