Deuteronomy 14:28-29

At the end of every three years thou shalt bring forth all the tithe of thine increase in the same year, and shalt lay it up within thy gates: and the Levite, because he hath no portion nor inheritance with thee, and the sojourner, and the fatherless, and the widow, that are within thy gates, shall come, and shall eat and be satisfied; that Jehovah thy God may bless thee in all the work of thy hand which thou doest.