Reference for Chullin 113:25

יש לו וישנה כעלה של וורד בין אגפיים מכלל דחזקיה סבר דלית ליה

I know only of the following Mishnah: If the hind legs of an animal were cut off below the knee-joint it is permitted, above the knee joint it is trefah; similarly, if the juncture of the tendons was gone it is trefah.<span class="x" onmousemove="('comment',' Infra 76a.');">⁸</span>

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