Reference for Chullin 39:28

א"ר ירמיה אמר שמואל

and the case is as follows: he commenced to nip at the slope of the head and, moving [his finger-nail] gradually downwards, ended the nipping below.<span class="x" onmousemove="('comment',' Although the nipping was concluded within the proper region, i.e., at the back of the neck, it is nevertheless invalid according to Samuel.');">¹²</span>

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