Reference for Chullin 117:40

כל בהמה שאין לה שינים למעלה בידוע שהיא מעלת גרה ומפרסת פרסה וטהורה

Furthermore, the rock-badger and the hare chew the cud, nevertheless they have upper teeth and are unclean! Now are teeth mentioned at all in the Torah? - Rather this is the meaning of the passage: If an animal has no upper teeth<span class="x" onmousemove="('comment',' Sc. the incisors of the upper jaw. The absence of the upper incisors and canines is a characteristic of all ruminants. The camel forms the exception to this order for it has canines in both jaws.');">¹⁷</span>

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