The tradition of guarding the holy sites was a deeply rooted responsibility, passed down through generations with impressive historical continuity. From the early days of the Tabernacle all the way to the era of the Second Temple, dedicated families maintained a careful watch over the sacred grounds.
The primary approach among commentators is that this continuous service represents an unbroken chain in time. Even during the period of the Second Temple, the exact system of gatekeepers originally established by David and Samuel was still firmly in place [מצודת דוד, רד"ק, ביאור שטיינזלץ]. These guards inherited their vital roles directly from their ancestors. Their forefathers had served during the time of David, keeping watch over the Tent of Meeting to ensure that unauthorized people did not enter the sacred area before the permanent Temple was built [מלבי"ם]. Conversely, another perspective suggests that the boundaries mentioned relate to physical space rather than time, marking a specific distance from a previous point up to the location of the designated gate [רש"י].
The guards were stationed at a specific eastern entrance known as the King's Gate. It earned this title because it faced east and served as the direct path the king would take when traveling from his personal palace into the Temple [מצודת דוד, רלב"ג, רד"ק].
The primary individuals tasked with this duty were Shallum and his brothers [רש"י, מצודת דוד], who stood watch at the entrances of the Temple Mount. The Temple Mount itself functioned as the camps of the Levites [מצודת דוד]. To manage this heavy responsibility, the Levite gatekeepers were highly organized, divided into specific camps and shifts based on their assigned zones of protection [רלב"ג].