Deuteronomy 12:19 "Be careful not to forsake the Levite"

The Levites are dedicated to the service of HaShem in the Beit Hamikdash. They were not given a separate portion of land in Eretz Yisrael as were the other tribes.

We are commanded to support them and provide for their needs. There are specific portions of our produce that we must give the Levites.

We are cautioned not to neglect their needs, and postpone these gifts which they require for their sustenance.