משנה: נָזִיר שֶׁגִּילַּח וְנוֹדַע לוֹ שֶׁהוּא טָמֵא. אִם טוּמְאָה יְדוּעָה סוֹתֵר וְאִם טוּמְאַת הַתְּהוֹם אֵינוֹ סוֹתֵר. אִם עַד שֶלֹּא גִילַּח בֵּין כָּךְ וּבֵין כָּךְ סוֹתֵר. כֵּיצַד. יָרַד לִטְבּוֹל בַּמְּעָרָה וְנִמְצָא מֵת צָף עַל פִּי הַמְּעָרָה טָמֵא. נִמְצָא מְשׁוּקָּע בְּקַרְקַע הַמְּעָרָה יָרַד לְהָקֵר טָהוֹר לִיטַּהֵר מִטֻּמְאַת הַמֵּת טָמֵא שֶׁחֶזְקַת הַטָּמֵא טָמֵא וְחֶזְקַת הַטָּהוֹר טָהוֹר שֶׁרַגְלַיִם לַדָּבָר.
MISHNAH: If a nazir was informed that he was impure after he had shaved and it was a known impurity he cancels, but if it was impurity of the abyss he does not cancel. If it was before he shaved, he cancels in any case. How is that? If he went to immerse himself in a cave where a corpse was floating at the entrance, he is impure. If it was found buried in the ground and he went there to refresh himself, he is pure, but to purify himself from the impurity of the dead he is impure since the presumptive state of the impure is impure and the presumptive state of the pure is pure, for it is not unsubstantiated.