Related for Chullin 274:40
אין פוחתין לפאה מששים אע"פ שאמרו הפאה אין לה שיעור
He [R'Johanan] said to him, 'Use the term reheloth'.<span class="x" onmousemove="('comment',' with the feminine plural ending oth.');"><sup>21</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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