Related for Chullin 274:8
ששים ונותן סלע אחת לכהן
Samuel said, [At least] sixty [sela's], and he gives thereof one sela' to the priest.
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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