Deuteronomy 12:17-19

17Within your gates you must not eat the tithe of your grain or new wine or oil, the firstborn of your herds or flocks, any of the offerings that you have vowed to give, or your freewill offerings or special gifts. 18Instead, you must eat them in the presence of the LORD your God at the place the LORD your God will choose—you, your sons and daughters, your menservants and maidservants, and the Levite within your gates. Rejoice before the LORD your God in all you do, 19and be careful not to neglect the Levites as long as you live in your land.