Reference for Chullin 37:35

מחלוקת שהגרים שליש ושחט שני שליש דרבי יוסי בר ר' יהודה סבר

But in the case where the slaughterer first cut two thirds [in the top ring] and then the last third above it, all are of the opinion that the slaughtering is valid, for we have learnt: The greater part of an organ is equivalent to [the whole of] it.

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