Reference for Chullin 257:21

תקרובת עבודת כוכבים של אוכלין מטמאין באוהל

Abaye said: Behold they have stated that foodstuffs that adhere closely [to vessels] are like the vessels themselves.<span class="x" onmousemove="('comment',' E.g., pieces of dough found in the cracks of the kneading vessels are regarded as part of the vessel and, if unclean, can render unclean men and vessels. Cf. Pes. 45a, 46a. d" k');"="">¹³</span>

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