Deuteronomy 14:27-29

and the Levite that is within thy gates; thou shalt not forsake him; for he hath no part nor inheritance with thee. At the end of three years thou shalt bring forth all the tithe of thine increase the same year, and shalt lay it up within thy gates: and the Levite, (because he hath no part nor inheritance with thee,) and the stranger, and the fatherless, and the widow, which are within thy gates, shall come, and shall eat and be satisfied; that the LORD thy God may bless thee in all the work of thine hand which thou doest.