Reference for Niddah 112:49

אלא הכי קאמר

if they declare the menstrual blood of Israelites clean, whose do they hold to be unclean? — Some words are missing from our Mishnah, this being the correct reading: FROM ISRAELITES are unclean, FROM SAMARITANS, R. MEIR DECLARES, ARE UNCLEAN, since Samaritans are true proselytes,<span class="x" onmousemove="('comment',' Whose menstrual blood is, therefore, as unclean as that of a proper Israelite. ');">⁴³</span>

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