The Triennial (Poor) Tithe

Deuteronomy 14:28-29

At the end of every three years, bring a tenth of all your produce for that year and lay it up within your gates.

Then the Levite (because he has no portion or inheritance among you), the foreigner, the fatherless, and the widow within your gates may come and eat and be satisfied. And the LORD your God will bless you in all the work of your hands.