Reference for Kelim 5:4

תַּנּוּר שֶׁהֻסַּק מֵאֲחוֹרָיו, אוֹ שֶׁהֻסַּק שֶׁלֹּא לְדַעְתּוֹ, אוֹ שֶׁהֻסַּק בְּבֵית הָאֻמָּן, טָמֵא. מַעֲשֶׂה שֶׁנָּפְלָה דְלֵקָה בְתַנּוּרֵי כְפַר סִגְנָה, וּבָא מַעֲשֶׂה לְיַבְנֶה, וְטִמְּאָן רַבָּן גַּמְלִיאֵל:

An oven that was heated from its outside, or that was that was heated without intent to complete it, or that was heated [while still] in the craftsman's house, is susceptible to impurity. There was a story that a fire fell on the ovens of Kfar Signa, and the story came to Yavneh, and Raban Gamliel ruled them susceptible to impurity.

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