Related for Chullin 274:2
מפי שמועה אמרה מפי חגי זכריה ומלאכי:
had it as a tradition deriving from Haggai, Zechariah and Malachi.<span class="x" onmousemove="('comment',' And therefore his opinion should be accepted as final.');"><sup>2</sup></span>
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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