Reference for Niddah 53:30

רבי יוסי ורבי יהודה ורבי שמעון מטהרין

He is of the opinion that any uncleanness with which anything of a different kind of uncleanness has been mixed is neutralized. Said R. Papa to them: 'Is this also the reason of R. Judah and R. Jose?'<span class="x" onmousemove="('comment',' Who are of the same opinion as R. Simeon supra. ');">²⁶</span>

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