Deuteronomy 12:17-19

17Within your city gates you may not eat the tenth of your grain, new wine, or fresh oil; the firstborn of your herd or flock; any of your vow offerings that you pledge; your freewill offerings; or your personal contributions.

18You are to eat them in the presence of the Lord your God at the place the Lord your God chooses — you, your son and daughter, your male and female slave, and the Levite who is within your city gates. Rejoice before the Lord your God in everything you do,

19and be careful not to neglect the Levite, as long as you live in your land.