Reference for Bekhorot 114:7

העיד רבי ישמעאל בן סתריאל מערקת לבינה לפני רבי

Said Rabbi: The reason of our Mishnah is now revealed.<span class="x" onmousemove="('comment',' The reason why R. Joshua in the Mishnah says that where the hide is still intact the animal is not considered an orphan is therefore because since the hide is of assistance to the offspring, it is as if the mother were alive.');">⁶</span>

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