Reference for Bekhorot 13:38

האי תנא סבר לה כוותיה בחדא ופליג עליה בחדא

adopting the view of R'Simeon.<span class="x" onmousemove="('comment',' Since the Baraitha describes the kalut born of a cow as unclean, this indicates that its views are in accordance with R. Simeon who holds that an unclean animal born from a clean animal is unclean.');">¹⁷</span>

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