Mishnah Parah 8:1: Two who were guarding the jug [containing water for mixing with ashes], if one became impure, they [the waters] are valid, because they were in the domain of the second one. If he [the one who became impure] purified himself, and the second one became impure, they are valid because they are in the domain of the first. If they both became impure at once, they [the waters] are invalid. If one of them did work, they are valid because they were in the domain of the second one. If he [the one who was working] stopped and the second did work, they are valid because they were in the domain of the first. If they both did work at once, they [the waters] are invalid.

שְׁנַיִם שֶׁהָיוּ שׁוֹמְרִים אֶת הַשֹּׁקֶת, נִטְמָא אַחַד מֵהֶם, כְּשֵׁרִים, מִפְּנֵי שֶׁהֵן בִּרְשׁוּתוֹ שֶׁל שֵׁנִי. טָהַר, וְנִטְמָא שֵׁנִי, כְּשֵׁרִים, מִפְּנֵי שֶׁהֵן בִּרְשׁוּתוֹ שֶׁל רִאשׁוֹן. נִטְמְאוּ שְׁנֵיהֶן כְּאַחַת, פְּסוּלִין. עָשָׂה אַחַד מֵהֶן מְלָאכָה, כְּשֵׁרִין, מִפְּנֵי שֶׁהֵן בִּרְשׁוּתוֹ שֶׁל שֵׁנִי. עָמַד, וְעָשָׂה הַשֵּׁנִי מְלָאכָה, כְּשֵׁרִין, מִפְּנֵי שֶׁהֵן בִּרְשׁוּתוֹ שֶׁל רִאשׁוֹן. עָשׂוּ שְׁנֵיהֶן כְּאֶחָד, פְּסוּלִין:

Mishnah Parah 8:2: One who is sanctifying the chatat waters should not wear shoes, for if liquid should fall on the shoe, it becomes impure [relative to the chatat], and it makes him [who wears it] impure. Behold [it is as though] he says [to the shoe]: "That which renders you impure [i.e. liquid] does not impurify me [for liquids to not render people impure], yet you have rendered me impure!" If liquid fell on his flesh, he is [still] pure. If it fell on his clothing, they become impure and they make him [who wears them] impure. Behold [it is as though] he says [to the clothing]: "That which renders you impure [i.e. liquid] does not impurify me, yet you have rendered me impure!"

הַמְקַדֵּשׁ מֵי חַטָּאת, לֹא יִנְעוֹל אֶת הַסַּנְדָּל. שֶׁאִם נָפְלוּ מַשְׁקִין עַל הַסַּנְדָּל, נִטְמָא וְטִמְּאָהוּ. הֲרֵי הוּא אוֹמֵר, מְטַמְּאֶיךָ לֹא טִמְּאוּנִי וְאַתָּה טִמֵּאתָנִי. נָפְלוּ מַשְׁקִין עַל בְּשָׂרוֹ, טָהוֹר. נָפְלוּ עַל כְּסוּתוֹ, נִטְמֵאת וְטִמְּאַתּוּ. הֲרֵי זֶה אוֹמֵר, מְטַמְּאֶיךָ לֹא טִמְּאוּנִי וְאַתָּה טִמֵּאתָנִי: