Reference for Bava Batra 47:3

א"ל רבא רוב ומצוי קא אמרת רוב ומצוי ליכא למאן דאמר

is found in the 'anteroom'<span class="x" onmousemove="('comment',' For an explanation of these terms. v. Niddah, ad init. ');">⁴</span> and there is any doubt about its character, it is reckoned unclean, because it is presumed to be from the 'source'<span class="x" onmousemove="('comment',' For an explanation of these terms. v. Niddah, ad init. ');">⁴</span>

Jastrow

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