זבים ג׳Zavim 3

Mishnah 1א׳

הַזָּב וְהַטָּהוֹר שֶׁיָּשְׁבוּ בִסְפִינָה אוֹ בְאַסְדָּא אוֹ שֶׁרָכְבוּ עַל גַּבֵּי בְהֵמָה, אַף עַל פִּי שֶׁאֵין בִּגְדֵיהֶם נוֹגְעִים, הֲרֵי אֵלּוּ טְמֵאִים מִדְרָס. יָשְׁבוּ עַל הַנֶּסֶר, עַל הַסַּפְסָל, עַל הַגָּשִׁישׁ שֶׁל מִטָּה וְעַל הָאַכְלוֹנָס, בִּזְמַן שֶׁהֵן מַחְגִּירִין, עָלוּ בְאִילָן שֶׁכֹּחוֹ רַע, בְּסוֹכָה שֶׁכֹּחָהּ רַע, בְּאִילָן יָפֶה, בְּסֻלָּם מִצְרִי בִּזְמַן שֶׁאֵינוֹ קָבוּעַ בְּמַסְמֵר, עַל הַכֶּבֶשׁ וְעַל הַקּוֹרָה וְעַל הַדֶּלֶת בִּזְמַן שֶׁאֵין עֲשׂוּיִין בְּטִיט, טְמֵאִים. רַבִּי יְהוּדָה מְטַהֵר:

[If] a zav and a clean person sat together on a boat or on a raft or they are riding on an animal, even though their clothing do not touch, they are unclean due to [uncleanliness called] midras [treading contact]. [If] they sat on a plank, a bench, a bed frame or a beam that are insecure, [or] if they [both] climbed up a tree that is weak, or [they were] on a weak branch in a strong tree, [or they were climbing] an Egyptian ladder that was not securely [to a wall] with a nail, [or they sat together] on a bridge, a rafter or on a door that was not made [secured] with clay, they are unclean. Rabbi Yehuda says they are clean.

Mishnah 2ב׳

מְגִיפִין אוֹ פוֹתְחִין. וַחֲכָמִים אוֹמְרִים, עַד שֶׁיְּהֵא זֶה מֵגִיף וְזֶה פוֹתֵחַ. מַעֲלִין זֶה אֶת זֶה מִן הַבּוֹר. רַבִּי יְהוּדָה אוֹמֵר, עַד שֶׁיְּהֵא הַטָּהוֹר מַעֲלֶה אֶת הַטָּמֵא. מַפְשִׁילִין בַּחֲבָלִין. וַחֲכָמִים אוֹמְרִים, עַד שֶׁיִּהְיֶה זֶה מוֹשֵׁךְ הֵילֵךְ וְזֶה מוֹשֵׁךְ הֵילֵךְ. אוֹרְגִים, בֵּין בְּעוֹמְדִין בֵּין בְּיוֹשְׁבִין אוֹ טוֹחֲנִין. רַבִּי שִׁמְעוֹן מְטַהֵר בְּכֻלָּן, חוּץ מִן הַטּוֹחֲנִין בְּרֵחַיִם שֶׁל יָד. פּוֹרְקִין מִן הַחֲמוֹר אוֹ טוֹעֲנִין, בִּזְמַן שֶׁמַּשָּׂאָם כָּבֵד, טְמֵאִין. בִּזְמַן שֶׁמַּשָׂאָם קַל, טְהוֹרִין. וְכֻלָּן טְהוֹרִין לִבְנֵי הַכְּנֶסֶת וּטְמֵאִין לַתְּרוּמָה:

[If a zav and a clean person] close or open [a door together, the clean person and his clothes are unclean], [but] the Sages say, [he does not become unclean unless] one is closing [the door] and one is opening [the door]. If one was raising the other from a pit [the clean person and his clothes are unclean]. Rabbi Yehuda says, only if the clean one is the one raising the unclean one. [If they were] twisting ropes together [the clean person and his clothes are unclean], [but] the Sages say, only when one is pulling in one direction and the other is pulling in the opposite direction. [If they were] weaving [together], whether standing or sitting, or they are grinding [wheat, the clean person and his clothes are unclean]. Rabbi Shimon [says that in all the cases] the clean man remains clean, unless they were grinding with a hand mill. [If they were] unloading a donkey or loading it, if the load is heavy, they are unclean, if the load is light, they are clean. In both cases [whether the load is light or heavy] they are clean to join members of the synagogue [who eat chullin in purity] but are [considered] unclean [if he is a kohen] to eat terumah [a portion of a crop given to a kohen which becomes holy upon separation, and can only be consumed by the kohen or his household].