Translation:Mishnah/Seder Zeraim/Tractate Peah/Chapter 2/7

If a field was harvested by Samaritans, or harvested by robbers,
Or if ants chewed it up (or locusts consumed it),
Or if it was broken by wind or an animal, he is exempt.
If he harvests half, and robbers harvest half,
He is exempt as the obligation of the corner is when the crop is standing.