סְפֵק דִּבְרֵי סוֹפְרִים כֵּיצַד. סָפֵק אָכַל אֳכָלִין טְמֵאִין וְשָׁתָה מַשְׁקִין טְמֵאִין סָפֵק שֶׁלֹּא אָכַל וְשֶׁלֹּא שָׁתָה. סָפֵק שֶׁבָּא רֹאשׁוֹ וְרֻבּוֹ בְּמַיִם שְׁאוּבִין אוֹ שֶׁנָּפְלוּ עָלָיו שְׁלֹשָׁה לוֹגִין מַיִם שְׁאוּבִין סָפֵק שֶׁלֹּא בָּא וְשֶׁלֹּא נָפְלוּ הֲרֵי זֶה טָהוֹר. וְכֵן אִם אָכַל אֳכָלִין טְמֵאִין אוֹ שָׁתָה מַשְׁקִין טְמֵאִין אוֹ בָּא בְּמַיִם שְׁאוּבִין אוֹ נָפְלוּ עָלָיו שְׁלֹשָׁה לוֹגִין מַיִם שְׁאוּבִין וְסָפֵק נָגַע בְּטָהֳרוֹת אֵלּוּ סָפֵק לֹא נָגַע הֲרֵי טָהֳרוֹת אֵלּוּ טְהוֹרוֹת. וְכֵן הָאוֹכֵל סְפֵק אֳכָלִין טְמֵאִים וְהַשּׁוֹתֶה מַשְׁקִין שֶׁהֵן טְמֵאִים בְּסָפֵק הֲרֵי זֶה טָהוֹר. וְכֵן הָאוֹכֵל תְּרוּמָה תְּלוּיָה טָהוֹר. וְכֵן כָּל כַּיּוֹצֵא בְּאֵלּוּ מִוַּלְדֵי טֻמְאוֹת שֶׁהֵן מִדִּבְרֵי סוֹפְרִים סְפֵקָן טָהוֹר. אֲבָל אַב [הַטֻּמְאָה] שֶׁהוּא מִדִּבְרֵי סוֹפְרִים סְפֵקוֹ טָמֵא אֶלָּא אִם כֵּן הָיָה הָאָב עַצְמוֹ טָמֵא בְּסָפֵק כְּגוֹן בֵּית הַפְּרָס וְאֶרֶץ הָעַמִּים שֶׁאֵין שׂוֹרְפִין עַל סְפֵק מַגָּעָן כְּמוֹ שֶׁבֵּאַרְנוּ:
What is meant by a doubt concerning a point of Rabbinic Law? For example, if there is a doubt whether or not a person ate impure foods or drank impure liquids, or there is a doubt whether or not a person inserted his head and the majority of his body in drawn water or three lugim of drawn water fell upon him, he is pure. Similarly, if a person ate impure foods or drank impure liquids or inserted his head and the majority of his body in drawn water or had three lugim of drawn water fall upon him and then a question arose whether or not he touched particular pure entities, those pure entities remain pure. Similarly, if he ate foods that are questionably impure or drank liquids that are questionably impure, he is deemed pure. Similarly, one who partakes of terumah whose status is held in abeyance, is pure. Similarly, in all analogous situations where there is a question regarding the status of derivatives of impurity, the person or the object is deemed pure. If, however, there is a question regarding a source of impurity, even one of Rabbinic origin, the person or the object is deemed impure unless the source of impurity was itself of doubtful status, e.g., a beit hapras or the earth of the Diaspora. Terumah is not burned because of a doubt whether it touched such substances, as was explained.
