Reference for Chullin 37:23

מידי דהוה אחצי קנה פגום ורבנן

But in the case where the slaughterer first cut a third above the top ring and then the other two thirds in it, all are of the opinion that the slaughtering is invalid; because at the moment when the life escapes<span class="x" onmousemove="('comment',' This occurs as soon as the larger Portion of the windpipe has been cut through; i.e., during the cutting of the middle third.');">¹²</span>

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