Reference for Bekhorot 47:26

מי קתני הוא

What he means is this:<span class="x" onmousemove="('comment',' And in either case it is exempt from the law of the firstling, for we only entertain a doubt that it might be a stranger if the animal had given birth previously. But in respect of the infringement of the prohibition of killing the animal and its young on the same day, there is a doubt.');">¹⁴</span>

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