Reference for Chullin 141:27

(ויקרא יא, מ) והאוכל מנבלתה יכבס בגדיו

so a clean object that has been swallowed cannot be rendered unclean.<span class="x" onmousemove="('comment',' E.g., if a person swallowed a clean ring and subsequently entered a room where_ a corpse lay, the ring would not become unclean though he himself is rendered unclean; v. infra.');">¹⁶</span>

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