Deuteronomy 24:20-24

When you beat the olives off your olive tree, you are not to search through the branches again; that shall be left for the stranger, the orphan, and for the widow.

“When you gather the grapes of your vineyard, you are not to go over it again; that shall be left for the stranger, the orphan, and the widow.

And you shall remember that you were a slave in the land of Egypt; therefore I am commanding you to do this thing.