Leviticus 19
9 Ref And when you get in the grain from your land, do not let all the grain be cut from the edges of the field, or take up what has been dropped on the earth after the getting in of the grain.
10 Ref And do not take all the grapes from your vine-garden, or the fruit dropped on the earth; let the poor man, and the man from another country, have these: I am the Lord your God.