Reference for Chullin 267:33

אל תקניטני שבלשון יחיד אני שונה אותה

for it has been taught: R'Judah B'Agra says in the name of R'Meir: Gleanings that are in doubt are deemed to be gleanings, forgotten sheaves that are in doubt are deemed to be forgotten sheaves, and corners of the field that are in doubt are deemed to be corners of the field.

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