Related for Chullin 274:28
דאורייתא בששים
- The law of the Torah is as Samuel stated it;<span class="x" onmousemove="('comment',' That one grain discharges the obligation of terumah.');"><sup>14</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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