(Numbers 1:47-53) The Census of Fighting-Aged Men: No Levites Allowed
In Numbers chapter one, we read that Hashem commands Moshe to take a census of all men aged 20 years and older. These men would be counted as the men able to fight in Israel’s army.
In commanding this census, however, Hashem makes one caveat: absolutely zero Levites were to be numbered in the ranks of war-fighters. (Numbers 1:47-49).
The Levites, instead, were to be numbered in a different census, for a different type of warfare: spiritual warfare. Indeed, Hashem tells us that He has set aside the tribe of Levi to be His portion among all the Israelites (Numbers 3:5-16). The Levites are given the duties of:
Guarding the Tabernacle.
Guarding the Holy of Holies, where the Arm of the Pact (or Covenant) resided: meaning where Hashem dwelled.
Guarding all the Jewish people unto life by performing the daily sacrifices and burnt offerings.

