Deuteronomy 12:17-19

17You may not eat within your gates the tithe of your grain or new wine or oil, or the firstborn of your herd or of your flock, or any of your vow offerings that you vow, or your freewill offerings, or the offering of your hand.

18Rather you are to eat them before Adonai your God in the place Adonai your God chooses—you, your son and daughter, your slave and maid, and the Levite within your gates—and you will rejoice before Adonai your God in every undertaking of your hand.

19Be careful that you do not neglect the Levite as long as you live on the earth.