דברי הימים א, פרק ד׳, פסוק כ״ח

The tribe of Simeon experienced a unique living arrangement, as their assigned land was entirely absorbed within the borders of another tribe. The primary approach among commentators is that their settlement in places like Beersheba actually involved moving into cities that originally belonged to the tribe of Judah. These locations were specifically handed over to Simeon so they would have a place to live [רש״י, מצודת דוד, ביאור שטיינזלץ].

The historical record of these cities appears earlier in the Book of Joshua, though sometimes the names of the locations feature slight variations [מצודת דוד]. The tribe of Simeon continued to live in this shared arrangement for generations. However, this setup only lasted until the reign of King David, when the territorial borders shifted. Certain locations, such as the city of Ziklag, were taken out of Simeon's control and transferred directly to the kings of Judah [מלבי״ם].