Commentaire sur Nega'im 13:10
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:
S'il se tenait à l'intérieur et qu'il tendait la main à l'extérieur et que ses anneaux étaient dans ses mains, s'il y restait assez longtemps pour manger une demi-miche de pain, ils sont impurs. S'il se tenait à l'extérieur et tendait la main à l'intérieur et que ses anneaux étaient dans ses mains, le rabbin Yehuda le déclare immédiatement impur mais les Sages disent, jusqu'à ce qu'il reste assez longtemps pour manger une demi-miche de pain. Ils ont dit à Rabbi Yehuda: "Si quand tout son corps est impur, les choses qui sont sur lui ne deviennent impures que s'il reste assez longtemps pour manger une demi-miche de pain, alors que tout son corps n'est pas impur ne devrait pas ce qui est sur lui certainement. pas devenir impur tant qu'il n'est pas resté assez longtemps pour manger un demi-pain? "
Bartenura on Mishnah Negaim
English Explanation of Mishnah Negaim
If he was standing outside, stretching his hands inside, with his rings on his hands: Rabbi Judah says that they are unclean immediately, But the sages say: only after he leaves them there as much time as is required for the eating of half a loaf.
They said to Rabbi Judah: if when all his body is unclean he does not render that which is on him unclean unless he stayed there long enough to eat half a loaf, when all of his body is not unclean, is it not logical that he should not render that which is on him unclean unless he stayed there long enough to eat half a loaf?
Today's mishnah continues yesterday's topic: how long does it take for things which he wears to become impure in a house afflicted by a nega.
Section one: The person himself is impure immediately upon entering the house afflicted by the nega. The rings on his hands become impure even though they are outside the house. This is because his hands are part of his body and it is as if they are inside the house. However, the rings don't become impure until he stays in the house the amount of time it takes to eat half a loaf of bread. This is the same as the rule in yesterday's mishnah.
Section two: In this case he stands outside and remains pure (because his head and body didn't enter the house see mishnah 8), but he stretches his hands inside while wearing his rings. Rabbi Judah says that this is like the situation of simply bringing rings into a house. As we saw in yesterday's mishnah, in such a case, the rings are impure immediately.
The other rabbis hold that the rings must stay in the house for at least the length of time it takes to eat half a loaf of bread. They argue that in section one, where his entire body was impure, the rings had to stay on his fingers (although they were outside of the house) for at least that amount of time. All the more so, if his body remains pure, the rings must be in the house for at least the amount of time it takes to eat half of a loaf of bread.