Reference for Chullin 111:37

בודקין לחולדה ביד אבל לא במסמר

R'Nahman said to R''Anan: 'Did you not tell us, Master, that Samuel used to make the test with the finger and would declare the bird permitted?<span class="x" onmousemove="('comment',' It nothing of the brain substance escaped, although there is an obvious hole or crack in the skull.');">¹⁶</span>

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