Related for Chullin 274:27
דאורייתא בששים דרבנן בארבעים
But has not Samuel stated that one grain of wheat frees the stack?<span class="x" onmousemove="('comment',' The obligation of terumah can be discharged by the removal of one grain from the heap, since the Torah does not prescribe any specific amount.');"><sup>13</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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