Mishnah Negaim 13:10: If he was standing inside and he extended his hand outside and his rings were in his hands, if he remained there long enough to eat half a loaf of bread, they are impure. If he was standing outside and extended his hand inside and his rings were in his hands, Rabbi Yehuda declares him impure immediately but the Sages say, until he remains long enough to eat half a loaf of bread. They said to Rabbi Yehuda, "If when his entire body is impure, things that are on him only become impure if he remains long enough to eat half a loaf of bread, when his whole body is not impure should not what is on him certainly not become impure until he remains long enough to eat half a loaf?"

הָיָה עוֹמֵד בִּפְנִים וּפָשַׁט יָדוֹ לַחוּץ וְטַבְּעוֹתָיו בְּיָדָיו, אִם שָׁהָה כְדֵי אֲכִילַת פְּרָס, טְמֵאוֹת. הָיָה עוֹמֵד בַּחוּץ וּפָשַׁט יָדוֹ לִפְנִים וְטַבְּעוֹתָיו בְּיָדָיו, רַבִּי יְהוּדָה מְטַמֵּא מִיָּד. וַחֲכָמִים אוֹמְרִים, עַד שֶׁיִּשְׁהֶה כְדֵי אֲכִילַת פְּרָס. אָמְרוּ לוֹ לְרַבִּי יְהוּדָה, מָה אִם בִּזְמַן שֶׁכָּל גּוּפוֹ טָמֵא, לֹא טִמֵּא אֶת מַה שֶּׁעָלָיו עַד שֶׁיִּשְׁהֶה כְדֵי אֲכִילַת פְּרָס, בִּזְמַן שֶׁאֵין כָּל גּוּפוֹ טָמֵא, אֵינוֹ דִין שֶׁלֹּא יְטַמֵּא אֶת מַה שֶּׁעָלָיו עַד שֶׁיִּשְׁהֶה כְדֵי אֲכִילַת פְּרָס:

Mishnah Negaim 13:11: A leper who enters a house, all of the vessels within it become impure even up to the beams. Rabbi Shimon says, [only] up to four cubits. The vessels become impure immediately. Rabbi Yehuda says, not until he stays long enough to light a candle.

מְצֹרָע שֶׁנִּכְנַס לְבַיִת, כָּל הַכֵּלִים שֶׁיֶּשׁ שָׁם טְמֵאִין, אֲפִלּוּ עַד הַקּוֹרוֹת. רַבִּי שִׁמְעוֹן אוֹמֵר, עַד אַרְבַּע אַמּוֹת. כֵּלִים, מִיָּד טְמֵאִין. רַבִּי יְהוּדָה אוֹמֵר, אִם שָׁהָה כְדֵי הַדְלָקַת הַנֵּר: