Reference for Bekhorot 118:39

ודאי מנין הראוי אמרינן

It has been taught in accordance with the ruling of Raba: If he had ten lambs and he led them into a shed, and after he had counted five<span class="x" onmousemove="('comment',' The number five is not strictly meant, as it can be any number up to nine.');">²⁸</span>

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