Reference for Negaim 3:3

עוֹר הַבָּשָׂר מִטַּמֵּא בִשְׁנֵי שָׁבוּעוֹת וּבִשְׁלשָׁה סִימָנִין, בְּשֵׂעָר לָבָן וּבְמִחְיָה וּבְפִסְיוֹן. בְּשֵׂעָר לָבָן וּבְמִחְיָה, בַּתְּחִלָּה, וּבְסוֹף שָׁבוּעַ רִאשׁוֹן, וּבְסוֹף שָׁבוּעַ שֵׁנִי, לְאַחַר הַפְּטוּר. וּבְפִסְיוֹן, בְּסוֹף שָׁבוּעַ רִאשׁוֹן, וּבְסוֹף שָׁבוּעַ שֵׁנִי, לְאַחַר הַפְּטוּר. וּמִטַּמֵּא בִשְׁנֵי שָׁבוּעוֹת, שֶׁהֵן שְׁלשָׁה עָשָׂר יוֹם:

Skin of the flesh [that has a <i>Nega</i>] is made impure after two weeks or through three signs: white hair, a healed patch [of skin], or expansion. Regarding white hair and a healed patch, [they cause impurity] initially, at the end of the first week [of quarantine], at the end of the second week, or after the exemption. Regarding expansion, at the end of the first week, at the end of the second week, or after the exemption. And it is made impure after two weeks, which are [actually] thirteen days.

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