Reference for Bekhorot 42:22

אמר ליה רב פפא לאביי

R'Hisda thereupon asked: How long is the period in the case of an animal?<span class="x" onmousemove="('comment',' I.e., if it miscarried and is not therefore exempt from the law of the firstling.');">¹⁶</span>

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