Deuteronomy 14:27-29

27As for the Levites in your villages, you must not ignore them, for they have no allotment or inheritance along with you.

28At the end of every three years you must bring all the tithe of your produce, in that very year, and you must store it up in your villages.

29Then the Levites (because they have no allotment or inheritance with you), the resident foreigners, the orphans, and the widows of your villages may come and eat their fill so that the Lord your God may bless you in all the work you do.