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:
Más alto que estos: alguien que tiene relaciones sexuales con un niddah [una mujer que está menstruando o ha menstruado, pero aún no se ha sumergido], ya que hace impura la parte inferior [capa] de lo que se encuentra debajo de él en grado similar a la parte superior. Más alto que esto: la descarga genital anormal de un zav [hombre con una descarga genital anormal], su saliva, su semen y su orina, y la sangre de la menstruación, ya que transmiten impureza tanto por contacto como por transporte. Más alto que estos: la impureza de una silla de montar, ya que transmite impureza incluso a lo que se encuentra debajo de una piedra pesada. Más alto que una silla de montar: sobre lo que uno se acuesta, ya que el contacto con él es igual a llevarlo. Más alto de lo que uno yace: un zav ; porque un zav transmite impureza a lo que él miente, mientras que lo que miente no transmite el mismo nivel de impureza a aquello sobre lo que yace.
Tosefta Kelim Kamma
There is a stringency with corpse-impurity that there is not with a ba'al niddah (one who has intercourse with a menstruant), and [there is a stringency] with a ba'al niddah that there is not with corpse-impurity. That [one contaminated by] corpse-impurity requires sprinkling on the third day and the seventh day, which is not the case with a ba'al niddah. The stringency with a ba'al niddah is that a ba'al niddah defiles the bottom [bedding] just as the top bedding, which is not the case with corpse-impurity. Rabbi Yosei says, the emission of a zav, his spit, his semen, and his urine, [and the blood of a niddah (per GR"A)], and a revi'it of blood of a corpse [also defile both the top and bottom bedding]. Why did they say a "revi'it"? Because anyone who crosses the threshold of creation has [at least] a revi'it of blood. And regarding the blood of a niddah and [contamination with] riding-uncleanliness (Lev. 15:9, see Jastrow ("מרכב")), there is a stringency with [a niddah] that there is not with riding-uncleanliness, and with riding-uncleanliness that there is not with [a niddah]. That [the niddah] is equivalent to one who renders a person impure or clothing impure by contact or by carrying, which is not the case with riding-uncleanliness (Kel. 1:3). The stringency with riding-uncleanliness is that one who possesses riding-uncleanliness can impart impurity [even] under a heavy stone, which is not the case with [a niddah].
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