Related for Chullin 274:17
והא רב ושמואל דאמרי תרוייהו
For did not Rab and Samuel both rule that the proper measure for the first of the fleece is one sixtieth part?<span class="x" onmousemove="('comment',' I.e., the amount to be given to the priest shall not be less than one sixtieth part of the whole; whereas now it is suggested, according to Rab, that out of a total of thirty.seven and a half sela's five shall be given to the priest, almost one-seventh!');"><sup>8</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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