Deuteronomy 14:28-29

28“At the end of every third year you shall bring out the tithe of your produce of that year and store it up within your gates.

29And the Levite, because he has no portion nor inheritance with you, and the stranger and the fatherless and the widow who are within your gates, may come and eat and be satisfied, that the Lord your God may bless you in all the work of your hand which you do.