Deuteronomy 24:19-22

When you harvest your grain and forget a sheaf back in the field, don’t go back and get it; leave it for the foreigner, the orphan, and the widow so that GOD, your God, will bless you in all your work. When you shake the olives off your trees, don’t go back over the branches and strip them bare—what’s left is for the foreigner, the orphan, and the widow. And when you cut the grapes in your vineyard, don’t take every last grape—leave a few for the foreigner, the orphan, and the widow. Don’t ever forget that you were a slave in Egypt. I command you: Do what I’m telling you.