Reference for Chullin 106:14

ואי ס"ד לא הדר ביה לישרינהו

And why did he not keep them alive for twelve months?<span class="x" onmousemove="('comment',' In accordance with the principle, laid down infra 58a, if these birds live through this period it is a certain indication that they are not trefah.');">⁴</span>

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