John Gill Commentary Numbers 18:10

"As the most holy things shalt thou eat thereof; every male shall eat thereof: it shall be holy unto thee." — Numbers 18:10 (ASV)

In the most holy [place] shall you eat it Not in the holy of holies, eminently so called, nor in the holy place, for they were neither of them places to eat in; but in the tent of the congregation, as Aben Ezra, or court, as Jarchi; called most holy, in distinction from and in comparison of the camp of Israel, and their tents, as afterwards of Jerusalem, and their houses there, where they might not eat the most holy things.

every male shall eat it ; the sons of priests, and they only, not their wives, nor their daughters, and therefore not to be eaten at home, or in their own houses.

it shall be holy unto you ; separated only for the use of him and his sons.