Reference for Bava Kamma 76:12

מבין הנכרים טהורים מבין ישראל ומבין הכותים ר"מ מטמא וחכמים מטהרין שלא נחשדו (ישראל) על כתמיהן

or from Cutheans [after having been obtained from private places all agree in declaring them unclean.<span class="x" onmousemove="('comment',' For both Israelites and Cutheans are subject to the laws of purity and menstruation. ');">²⁰</span> But where they were brought from Cutheans who had already abandoned them to the public at large]<span class="x" onmousemove="('comment',' The bracketed passage follows the interpretation of this Mishnah given in Nid. 56b. ');">²¹</span>

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