The Triennial (Poor) Tithe

Deuteronomy 14:28-29

At the end of every three years you are to take all the tenths of your produce from that year and store it in your towns.

Then the Levi, because he has no share or inheritance like yours, along with the foreigner, the orphan and the widow living in your towns, will come, eat and be satisfied - so that ADONAI your God will bless you in everything your hands produce.