Reference for Tahorot 1:9

כִּכְּרוֹת הַקֹּדֶשׁ שֶׁבְּתוֹךְ גֻּמּוֹתֵיהֶם מַיִם מְקֻדָּשִׁים, נִטְמֵאת אַחַת מֵהֶן בְּשֶׁרֶץ, כֻּלָּן טְמֵאוֹת. בַּתְּרוּמָה, מְטַמֵּא שְׁנַיִם וּפוֹסֵל אֶחָד. אִם יֵשׁ בֵּינֵיהֶם מַשְׁקֶה טוֹפֵחַ, אַף בַּתְּרוּמָה, הַכֹּל טָמֵא:

Sanctified loaves whose ridges have sanctified [i.e. sufficiently pure] water in them, if one of them became impure by [coming into contact with] a vermin, they all become impure [any loaves touching it, along with any loaves touching those loaves, and so on, since even a fourth degree impurity, which generally does not generate further impurity, can render sanctified liquids primary, meaning they can then go on to render the rest of the loaves impure]. With [loaves of] <i>terumah</i>, [a vermin that comes into contact with one of them] makes two [loaves] impure and invalidates one [i.e the first loaf that touched the vermin becomes impure in the first degree, and any loaf that touches that loaf becomes impure in the second degree, and any loaf touching that loaf becomes impure in the third degree and thus is still invalid for <i>terumah</i>, but it does not cause any more impurity]. If there is dripping liquid between them, even with [loaves of] <i>terumah</i>, everything is impure [because the liquid, which is made primary by the loaves, and which causes the loaves it then touches to become secondary, and those loaves, in turn, cause the water touching the next loaves to become primary, and so on, to all the loaves].

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