Reference for Chullin 56:20

אימא

- A certain old man answered him: This is what R'Eleazar has said (others read: A certain old man said to R'Eleazar: This is what R'Johanan has said) : They may be pierced with a thorn and are thus rendered valid.<span class="x" onmousemove="('comment',' For the piercing of these veins does not form part of the slaughtering and therefore it is of no consequence if one paused or pressed whilst cutting them.');">⁹</span>

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