Related for Chullin 274:48
לשון תורה לעצמה לשון חכמים לעצמן
I remember when I was sitting before Rabbi, seventeen rows behind Rab, seeing sparks of fire leaping from the mouth of Rabbi into the mouth of Rab and from the mouth of Rab into the mouth of Rabbi, and I could not understand what they were saying; and you simply call him Abba Arika!' Then the other asked, 'What is the minimum quantity subject to the law of the first of the fleece'? - 'Sixty [sela's]', he replied.'
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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