Mishnah Taharos 8:5: The wife of an am ha'aretz who enters the house of a chaver [one who is meticulous about keeping all his foods pure] in order to take out his son or his daughter or his animal, the house is pure because she entered without permission [to stay in the house].

אֵשֶׁת עַם הָאָרֶץ שֶׁנִּכְנְסָה לְתוֹךְ בֵּיתוֹ שֶׁל חָבֵר לְהוֹצִיא בְנוֹ אוֹ בִתּוֹ אוֹ בְהֶמְתּוֹ, הַבַּיִת טָהוֹר, מִפְּנֵי שֶׁנִּכְנְסָה שֶׁלֹּא בִרְשׁוּת:

Mishnah Taharos 8:6: A rule was stated with regard to purities [of foods]: Anything which is designated for human consumption [if it becomes impure it] remains impure until it is rendered unfit for a dog to consume; and anything which is not designated for human consumption remains pure [and cannot be rendered impure] until one designates it for a human. How so? A fledgling which fell into a wine press, if one intended to take it out for a non-Jew [to eat], it is impure; if for a dog, it is pure. Rabbi Yochanan ben Nuri declares it impure [in either case]. If a deaf-mute, a shoteh, or a minor had the intention [to take it out, even for a non-Jew to eat], it is pure. If he took it out [for a non-Jew to eat], it is impure because these [categories of people] are capable of action but not of intention.

כְּלָל אָמְרוּ בַטָּהֳרוֹת, כֹּל הַמְיֻחָד לְאֹכֶל אָדָם, טָמֵא, עַד שֶׁיִּפָּסֵל מֵאֹכֶל הַכֶּלֶב. וְכֹל שֶׁאֵינוֹ מְיֻחָד לְאֹכֶל אָדָם, טָהוֹר, עַד שֶׁיְּיַחֲדֶנּוּ לְאָדָם. כֵּיצַד. גּוֹזָל שֶׁנָּפַל לְגַת וְחִשַּׁב עָלָיו לְהַעֲלוֹתוֹ לְנָכְרִי, טָמֵא. לְכֶלֶב, טָהוֹר. רַבִּי יוֹחָנָן בֶּן נוּרִי מְטַמֵּא. חִשַּׁב עָלָיו חֵרֵשׁ, שׁוֹטֶה וְקָטָן, טָהוֹר. אִם הֶעֱלָהוּ, טָמֵא, שֶׁיֵּשׁ לָהֶן מַעֲשֶׂה וְאֵין לָהֶן מַחֲשָׁבָה: