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Ever since Biblical times it has been understood that the poor have a right to a share in the harvest of the fields and gardens owned by their more fortunate fellow-men (cf. 6:141 - "give [unto the poor] their due on harvest-day". The determination of the "owners of the garden" to deprive the poor of this right is the second type of sin to which the above parable points: and inasmuch as it is a social sin, it connects with verses {10-13}.
The poor man has a right in the harvest-whether as a gleaner or as an artisan or a menial in an Eastern village. The rich owners of the orchard in the Parable wanted to steal a march at an early hour and defeat this right, but their greed was punished, so that it led to a greater loss to themselves. They wanted to cheat but had not the courage to face those they cheated, and by being in the field before any one was up they wanted to make it appear to the world that they were unconscious of any rights they were trampling on.