Reference for Menachot 190:10

ר' יהודה אומר כל מעשיהן בפנים [וכו']: אמר רבי אבהו בר כהנא ושניהן מקרא אחד דרשו (שמואל א כא, ו) והוא דרך חול אף כי היום יקדש בכלי

This view of R'Ashi, however, is beside the mark. For take whichever view you will, if the baking required the supervision of careful men then the kneading and the shaping also required the supervision of careful men; and if the kneading and the shaping did not require the supervision of careful men, then the baking also did not require the supervision of careful men.<span class="x" onmousemove="('comment',' But there is no valid reason for distinguishing between the baking and the other works.');">¹¹</span>

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