Reference for Eruvin 206:4

לא לעולם רבנן ואי עלתה בכריסו הכי נמי

forbidden [such acts] Only as a shebuth, what matters it here<span class="x" onmousemove="('comment',' Since removal with the teeth, whether one's own or one's friend's, is only a shebuth.');">¹⁰</span> whether he or his fellow does the biting? Consequently it<span class="x" onmousemove="('comment',' The ruling that the priest himself should not remove his wen even with his teeth while his friend may remove it only with his teeth but not with an instrument.');">⁶</span> must represent, must it not, the view of R'Eliezer who ruled elsewhere<span class="x" onmousemove="('comment',' Cf. Shah. 94b (the case of the finger nails) .');">⁹</span>

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