Commentary for Ketubot 13:10

ואי נמי כי הא דתניא חוט השדרה שנפסק ברובו דברי רבי ר' יעקב אומר אפי' ניקב הורה רבי כר' יעקב אמר רב הונא אין הלכה כר' יעקב

Alternatively like that which has been taught: If the cord of the spinal column is severed in its larger portion [the animal is trefa], the words of Rabbi. R. Jacob says: Even if it is only perforated [the animal is trefa]. Rabbi instructed according to R. Jacob. Huna said: The halakhah is not according to R. Jacob.

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