Reference for Chullin 66:2

מתקיף לה רב שימי בר אשי

will [through contact] render consecrated food unclean,<span class="x" onmousemove="('comment',' The general principle is that unclean matter defiles anything which comes in contact with it and that the thing so defiled becomes unclean in a lesser degree than that which defiled it. Further it has been laid down that uncleanness in common food extends to the second degree, in terumah');">²</span>

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