Reference for Bekhorot 118:43

אברור עשרה ואכניסם לדיר ואטול מהם אחד והשאר פטורים

Raba further said: If he had fourteen lambs and he led them into a shed, six [first] passing through one door,<span class="x" onmousemove="('comment',' There being two doors to the shed.');">³¹</span>

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