Reference for Chullin 40:30

קסבר

- The rule is: Whatever is indispensable in the slaughtering is indispensable in the precept of severance, and whatever is not indispensable in the slaughtering is not indispensable in the precept of severance.<span class="x" onmousemove="('comment',' Slaughtering is valid even if the skin at the throat had been removed by some other means before the slaughtering.');">²²</span>

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