Deuteronomy 14:28-29

28“1At the end of every third year you shall bring out all the tithe of your produce in that year, and you shall deposit it in your 2town.

29And the Levite, 3because he has no portion or inheritance among you, and 4the stranger, the 5orphan, and the widow who are in your 6town, shall come and 7eat and be satisfied, in order that 8the Lord your God may bless you in all the work of your hand which you do.