Reference for Niddah 120:29

בדקה אחת מהן ונמצאת טמאה היא טמאה ושתיהן טהורות

ruled that they were unclean and R. Nehemiah ruled that they were clean, and the Sages<span class="x" onmousemove="('comment',' The majority. ');">³⁰</span>

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