Deuteronomy 14:27-29

You shall not forsake the Levite who is within your gates, for he has no part nor inheritance with you. “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. And 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.