Deuteronomy 14:27-29

27And you shall not neglect the Levite who is within your towns, for he has no portion or inheritance with you.

28"At the end of every three years you shall bring out all the tithe of your produce in the same year and lay it up within your towns.

29And the Levite, because he has no portion or inheritance with you, and the sojourner, the fatherless, and the widow, who are within your towns, shall come and eat and be filled, that the Lord your God may bless you in all the work of your hands that you do.