Related for Chullin 274:20
בישראל שיש לו גיזין הרבה עסקינן ומבקש ליתנן לכהן ואמרי' ליה
among a number of priests, and we tell him that he must not give less than the weight of five sela's to each.
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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