Related for Chullin 274:37
דאורייתא אין לה שיעור דרבנן בששים
We have learnt it: The corner should not be less than one sixtieth part, even though they have said that no fixed measure is prescribed for the corner!<span class="x" onmousemove="('comment',' Pe'ah I, 2. ohkjr kjr');"><sup>19</sup></span>
Tosefta Peah
These are the things that have no set amount: the peah, the bikkurim, the r'iyah, charity, and learning Torah. Peah has a minimum amount but does not have a maximum amount. [If] one makes his entire field peah, it is not peah.
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