Reference for Menachot 141:2

מנלן דכתיב (ויקרא ב, יד) אביב לאו מכלל דאיכא דלאו אביב

MISHNAH. ONE MAY REAP [BEFORE THE 'OMER THE CORN] IN IRRIGATED FIELDS IN THE PLAIN, BUT ONE MAY NOT STACK IT. THE MEN OF JERICHO USED TO REAP [BEFORE THE 'OMER] WITH THE APPROVAL OF THE SAGES, AND USED TO STACK IT WITHOUT THE APPROVAL OF THE SAGES, BUT THEY DID NOT FORBID THEM. ONE MAY REAP THE UNRIPE CORN AND FEED CATTLE THEREWITH. SAID R. JUDAH, WHEN IS THIS SO? ONLY IF ONE HAD BEGUN TO REAP IT BEFORE IT HAD REACHED A

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