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Keilim 1:2-3
Keilim1: 2
[ב] לְמַעְלָה מֵהֶם: נְבֵלָה, וּמֵי חַטָּאת שֶׁיֵּשׁ בָּהֶם כְּדֵי הַזָּיָה, שֶׁהֵם מְטַמְּאִין אֶת הָאָדָם בְּמַשָּׂא לְטַמֵּא בְגָדִים בְּמַגָּע, וַחֲשׂוּכֵי בְגָדִים בְּמַגָּע.
Above them [are]: A neveilah, and purification waters that are sufficient for sprinkling, in that they render a person tamei via carrying to render clothing tamei via contact, but clothing is spared [from tumah] when there is [only] contact.
Keilim1: 3
[ג] לְמַעְלָה מֵהֶן: בּוֹעֵל נִדָּה, שֶׁהוּא מְטַמֵּא מִשְׁכָּב תַּחְתּוֹן כָּעֶלְיוֹן.
לְמַעְלָה מֵהֶן: זוֹבוֹ שֶׁל זָב וְרֻקּוֹ וְשִׁכְבַת זַרְעוֹ וּמֵימֵי רַגְלָיו, וְדַם הַנִּדָּה, שֶׁהֵן מְטַמְּאִין בְּמַגָּע וּבְמַשָּׂא.
לְמַעְלָה מֵהֶן: מֶרְכָּב, שֶׁהוּא מְטַמֵּא תַּחַת אֶבֶן מְסָמָא.
לְמַעְלָה מִן הַמֶּרְכָּב: מִשְׁכָּב, שֶׁשָּׁוֶה מַגָּעוֹ לְמַשָּׂאוֹ.
לְמַעְלָה מִן הַמִּשְׁכָּב: הַזָּב, שֶׁהַזָּב עוֹשֶׂה מִשְׁכָּב, וְאֵין מִשְׁכָּב עוֹשֶׂה מִשְׁכָּב.
Above them [is] one who cohabits with a niddah, in that he transmits tumah to a bed that is beneath [him] like that which is above.
Above them [is] the discharge of a zav, his spittle, his semen, his urine, and the [menstrual] blood of a niddah, in that they transmit tumah via contact and by being carried.
Above them [is] a merkav, in that it transmits tumah [from] beneath a placed rock.
Above a merkav [is] a mishkav, for its contact is equal to its being carried.
Above a mishkav [is] a zav, in that a zav creates a mishkav, whereas a mishkav does not create a mishkav.
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