Reference for Makhshirin 2:2

מֶרְחָץ טְמֵאָה, זֵעָתָהּ טְמֵאָה. וּטְהוֹרָה, בְּכִי יֻתַּן. הַבְּרֵכָה שֶׁבַּבַּיִת, הַבַּיִת מַזִּיעַ מֵחֲמָתָהּ, אִם טְמֵאָה, זֵעַת כָּל הַבַּיִת שֶׁמֵּחֲמַת הַבְּרֵכָה, טְמֵאָה:

Moisture from an impure bathhouse [that is, the water in it is impure] is impure. And [moisture from] a pure [bathhouse] achieves <i>BeKhi Yutan</i> [a state where liquid put upon food makes it susceptible to impurity]. [If] there is a pool in the house and the house [walls] exude moisture because of it, if [the pool] is impure, the moisture of the whole house caused by the pool is impure.

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