במדבר, פרק י״ח, פסוק ד׳

Organizing the service and security within the Tabernacle establishes a clear division of roles between the Priests and the Levites, creating a vital boundary that protects the public from the intense sanctity of the site. The Levites are assigned to join the Priestly family, serving as their dedicated secondary assistants [ביאור שטיינזלץ, העמק דבר]. This close partnership ensures that the Priests can complete their sacred duties efficiently, without ever needing to rely on an ordinary Israelite for help [אבן עזרא].

The Levites are tasked with guarding the entire courtyard of the Tabernacle, stationed just inside the surrounding curtains [ספורנו, ביאור יש״ר]. Their physical labor involves dismantling, transporting, and reassembling the structure, with the Priests directing each Levite to his specific job [רלב״ג]. The Levites also protect and maintain the sacred vessels. When the Priests are working deep inside the sanctuary, the Levites support them from the outside by handing them the necessary tools [העמק דבר]. Beyond these practical needs, the constant presence of guards serves a deeper purpose: it honors and elevates the sanctuary, as a king's palace guarded by watchmen is far more majestic than one left unguarded [רבנו בחיי].

A critical aspect of this arrangement is keeping unauthorized individuals away from the sacred service. Commentators differ on exactly who receives this strict warning. The primary approach among commentators is that God directs this command to the Priests and Levites themselves, requiring them to actively warn the Israelites to stay back [רש״י, שפתי חכמים, מזרחי, גור אריה]. By acting as a living buffer between the Tabernacle and the rest of the camp, the Levites prevent the Israelites from accidentally crossing into forbidden territory, thereby protecting the entire community from a deadly plague [בכור שור, גור אריה]. Although logic clearly dictates that if the Levites have strict boundaries, ordinary Israelites certainly do, the Torah must state this rule explicitly. Under the rules of Jewish law, a person cannot be punished based solely on a logical deduction [שפתי חכמים, מזרחי].

Alternatively, some explain that this rule is a direct warning to any unauthorized outsider, forbidding them from approaching the specific work reserved for the Priests [רלב״ג, רש״ר הירש]. According to this perspective, this command establishes the actual legal prohibition, while the severe consequences for violating it—such as death by heaven or strangulation—are detailed in another location where the Torah dictates that an approaching outsider will be put to death [חזקוני, רלב״ג, רש״ר הירש].