Deuteronomy 18:1 "The Priests the Levites all the tribe of Levi shall have no portion or inheritance with Israel"

When the Jewish people entered the Land of Israel and inherited it, HaShem allowed them to benefit from the spoils of war.

There are Mitzvot which explain when, where and which spoils are permitted to the people.

This Negative Mitzvah tells us that the tribe of Levi is not permitted to benefit from these spoils.