Reference for Chullin 140:15

פרה במעי גמל לא תטמא דמהלכי שמנה במהלכי ארבע הוא

Then an animal with unparted hoofs found in the womb of an animal also with unparted hoofs<span class="x" onmousemove="('comment',' The dam, however, wag a permitted animal as it was born of a clean animal.');">⁸</span>

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