מִפְּנֵּי מָה טִהֲרוּ חֲכָמִים סְפֵק טֻמְאָה בִּרְשׁוּת הָרַבִּים. שֶׁהֲרֵי הַצִּבּוּר עוֹשִׂין פֶּסַח בְּטֻמְאָה בִּזְמַן שֶׁהַטְּמֵאִים מְרֻבִּין. אִם טֻמְאָה וַדָּאִית נִדְחֵית מִפְּנֵיהֶן קַל וָחֹמֶר לִסְפֵק טֻמְאָה שֶׁאִסּוּר כָּל הַסְּפֵקוֹת מִדִּבְרֵיהֶן כְּמוֹ שֶׁבֵּאַרְנוּ בְּהִלְכוֹת בִּיאוֹת אֲסוּרוֹת. וּמִפְּנֵי מָה הֶחְמִירוּ בִּסְפֵק רְשׁוּת הַיָּחִיד. שֶׁהֲרֵי סוֹטָה שֶׁנִּסְתְּרָה אַף עַל פִּי שֶׁהַדָּבָר סָפֵק הֲרֵי הִיא טְמֵאָה לְבַעְלָהּ עַד שֶׁתִּשְׁתֶּה:
Why did the Sages rule that when there is a question of impurity in the public domain, the person should be considered pure? Because the community offers the Paschal sacrifice in a state of impurity when the majority of the people are impure. Now, if ritual impurity that was definitely established is superseded by the presence of the community, certainly this would apply to a mere question of the presence of impurity. For all stringencies observed because of doubt were instituted by the Sages, as we explained in Hilchot Bi'ot Assurot. Why did they rule stringently concerning a doubt in a private domain? For in the instance of a sotah who entered into privacy with the person concerning whom she was warned, even though there is only a doubt that she committed adultery, she is considered as impure with regard to her husband until she drinks the sotah waters.
