Related for Chullin 274:35
אלו דברים שאין להן שיעור
- By law of the Torah there is no fixed measure, but by Rabbinic enactment it is fixed as one sixtieth part.
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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