Mishnah Parah 8:3: The person who burns the red cow (of Numbers 19:1–22) or the bulls (that are burned pursuant to Leviticus 4:3–21 or 16:27) and the person who leads away the scapegoat (pursuant to Leviticus 16:7-10 and 26) render clothes [that they wear while so doing] unclean. The red cow, the bulls, and the scapegoat do not themselves render clothes [with which they come in contact] unclean. This one [the clothing] says [to the person]: “Those that render you unclean do not render me unclean, but you render me unclean.”

הַשּׂוֹרֵף פָּרָה, וּפָרִים, וְהַמְשַׁלֵּחַ אֶת הַשָּׂעִיר, מְטַמֵּא בְגָדִים. פָּרָה וּפָרִים וְשָׂעִיר הַמִּשְׁתַּלֵּחַ עַצְמָן אֵין מְטַמְּאִין בְּגָדִים. הֲרֵי זֶה אוֹמֵר, מְטַמְּאֶיךָ לֹא טִמְּאוּנִי וְאַתָּה טִמֵּאתָנִי:

Mishnah Parah 8:4: One who eats from the unslaughtered corpse of a kosher bird and it [the meat] is in his throat, the clothing [he is wearing] becomes impure. The corpse itself does not make the clothing impure [through contact]. Behold it [is as though the clothing] says [to the person]: That which renders you impure [i.e. the corpse] does not impurify me, yet you have rendered me impure!"

הָאוֹכֵל מִנִּבְלַת הָעוֹף הַטָּהוֹר וְהִיא בְּבֵית הַבְּלִיעָה, מְטַמֵּא בְגָדִים. הַנְּבֵלָה עַצְמָהּ אֵינָהּ מְטַמְּאָה בְגָדִים. הֲרֵי זֶה אוֹמֵר, מְטַמְּאֶיךָ לֹא טִמְּאוּנִי, וְאַתָּה טִמֵּאתָנִי: