Reference for Chullin 37:38

אבל שחט שני שליש והגרים שליש דברי הכל כשרה דהא תנן

If a slaughterer first cut a third [of the windpipe] outside the prescribed area, another third within it, a the last third outside it,<span class="x" onmousemove="('comment',' Lit., 'he deflected, he slaughtered and deflected'.');">¹⁷</span>

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