Inspecting the Holy Temple on Shabbos

The final law in the Rambam’s laws on constructing the Beis HaMikdash addresses the daily pre-dawn inspection by the Kohanim with torches in their hands. The exception is Shabbos, where they inspected with stationed lamps to avoid a rabbinic prohibition. Delve into the depths of this halacha. (Based on Likutei Sichos vol. 21 Vayakhel, sicha 1)