Reference for Chullin 72:45

אלא חבת הקדש מכשרא להו ומשויא להו אוכל הכא נמי חבת הקדש מכשרתה

which serves to include wood and frankincense.<span class="x" onmousemove="('comment',' That each is capable of being rendered unclean like ordinary foodstuffs,');">¹⁹</span> Now are wood and frankincense edible [so as to be in the same category as foodstuffs]? It must therefore be that sacred esteem puts them in the same category as foodstuffs and renders them susceptible to uncleanness. So in all cases sacred esteem will render foodstuffs susceptible to uncleanness.

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