Deuteronomy 14:27-29

And do not neglect the Levites in your town, for they will receive no allotment of land among you. “At the end of every third year, bring the entire tithe of that year’s harvest and store it in the nearest town. Give 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.