Deuteronomy 14:27-29

Also you shall not neglect the Levite who is in your town, for he has no portion or inheritance among you. “At the end of every third year you shall bring out all the tithe of your produce in that year, and shall deposit it in your town. The Levite, because he has no portion or inheritance among you, and the alien, the orphan and the widow who are in your town, shall come and eat and be satisfied, in order that the LORD your God may bless you in all the work of your hand which you do.