Related for Chullin 274:22
גופא רב ושמואל דאמרי תרוייהו
Rab and Samuel both ruled: The proper measure for the first of the fleece is on sixtieth part, for terumah one sixtieth part, and for the "corner" 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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