Deuteronomy 14:28-29

At the end of every third year, gather the tithe from all your produce of that year and put it aside in storage. Keep it in reserve for the Levite who won’t get any property or inheritance as you will, and for the foreigner, the orphan, and the widow who live in your neighborhood. That way they’ll have plenty to eat and GOD, your God, will bless you in all your work.