Reference for Bava Batra 47:2

אמר אביי אף אנן נמי תנינא דם שנמצא בפרוזדור ספיקו טמא שחזקתו מן המקור ואע"ג דאיכא עלייה דמקרבא

Abaye said: We too know R. Hanina's rule<span class="x" onmousemove="('comment',' That 'majority' is the decisive factor. ');">²</span> from the Mishnah. which says: 'If blood<span class="x" onmousemove="('comment',' The reference is to a woman who finds on her body blood which may be either the blood of childbirth, and therefore clean, or the blood of an issue and therefore unclean. V. Lev. XV. 25. ');">³</span>

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