Reference for Niddah 84:38

אי אמרת בלוע הוי טומאה בלועה לא מטמיא

you say that it is a concealed one, granted that no uncleanness is conveyed by means of contact,<span class="x" onmousemove="('comment',' The uncleanness by contact not applying to a concealed region of the body. ');">³⁷</span>

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