Deuteronomy 14:28-29

28“At the end of every third year, bring the entire tithe of that year’s harvest and store it in the nearest town.

29Give it to the Levites, who will receive no allotment of land among you, as well as to the foreigners living among you, the orphans, and the widows in your towns, so they can eat and be satisfied. Then the Lord your God will bless you in all your work.