The Levites hold a unique and dual role within the Tabernacle, serving as the vital, operational link between the priesthood and the entire nation. They are tasked with a heavy responsibility that encompasses both physical protection and logistical management.
Any duty or appointment given to a person is considered a formal charge [רש"י]. However, there are different perspectives on whose specific charge the Levites fulfill. One approach suggests that they act directly under the authority and command of Aaron the Priest [חזקוני]. In this capacity, they assist the priests by physically guarding the sacred space to prevent strangers from entering, while also managing the logistical preparations for the service and sacrifices, such as arranging the flour, wine, and oil [העמק דבר, מלבי"ם, ברכת אשר על התורה]. Another perspective maintains that this charge refers to the dedicated duties of the Levite tribe itself, such as singing during the offering of sacrifices and carrying the sacred vessels of the Tabernacle [ברכת אשר על התורה].
Beyond their obligations to the priesthood, the Levites carry a profound responsibility toward the entire nation. They are not merely servants to the priests; they act as the official representatives and messengers of the people. Because the Tabernacle and the Torah belong to all of Israel, the Levites guard this holy asset on behalf of the public. By doing so, they protect the people from accidentally wandering too close to the sacred grounds and incurring severe punishment [רש"ר הירש].
In practice, this representation means that the Levites perform the duties that technically rest upon the general public, particularly concerning the bringing of communal sacrifices [אבן עזרא, העמק דבר, חזקוני]. Originally, the responsibility of managing the affairs of the Tabernacle and caring for its service needs was meant to be given to the Sanhedrin, which naturally represents the entire community. However, following the sin of the Golden Calf, this privilege was transferred exclusively to the Levites [ספורנו, מלבי"ם].
Ultimately, guarding the Tabernacle is not a standard military watch. Rather, it is a comprehensive assumption of responsibility for all the needs of the holy site [ביאור שטיינזלץ]. The Levites perform this vital work as the faithful agents of both Aaron and the entire nation [רש"ר הירש].