Reference for Negaim 13:8

טָהוֹר שֶׁהִכְנִיס רֹאשׁוֹ וְרֻבּוֹ לְבַיִת טָמֵא, נִטְמָא. וְטָמֵא שֶׁהִכְנִיס רֹאשׁוֹ וְרֻבּוֹ לְבַיִת טָהוֹר, טִמְּאָהוּ. טַלִּית טְהוֹרָה שֶׁהִכְנִיס מִמֶּנָּה שָׁלשׁ עַל שָׁלשׁ לְבַיִת טָמֵא, נִטְמְאָה. וּטְמֵאָה שֶׁהִכְנִיס מִמֶּנָּה אֲפִלּוּ כַזַּיִת לְבַיִת טָהוֹר, טִמְּאַתּוּ:

A pure person who extended his head and most of his body into an impure house becomes impure. An impure person who extends his head and most of his body into a pure house makes it [the house] impure. A pure cloak of which a three-by-three [finger-length] piece entered an impure house becomes impure. [If it was] an impure [cloak], if he extended even the volume of an olive [of it] into a pure house, it makes [the house] impure.

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