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

HaShem chose the tribe of Levi and their descendants to serve in the Beit HaMikdash.

The tribe of Levi includes both the priests and the Levites.

This is their special privilege and they are considered different from the rest of the Jewish people in several ways.

When the Jewish people entered Eretz Yisrael and divided the land among the tribes as HaShem had instructed them, each tribe was assigned a portion of the Land of Israel.

The tribe of Levi, however, was not given a portion. HaShem told them "I will be your inheritance!"

He appointed them to serve in the Beit HaMikdash and granted them the benefits of the rest of the people's gift offerings.

We are commanded to present them with different gifts of food to provide for their needs so they can concentrate on their service in the Beit HaMikdash without financial worry.

This Negative Mitzvah instructs the tribe of Levi not to demand a share in the Land of Israel.