נגעים א׳Negaim 1

Mishnah 3ג׳

אַרְבָּעָה מַרְאוֹת הָאֵלּוּ מִצְטָרְפִין זֶה עִם זֶה לִפְטֹר, וּלְהַחְלִיט, וּלְהַסְגִּיר. לְהַסְגִּיר אֶת הָעוֹמֵד בְּסוֹף שָׁבוּעַ רִאשׁוֹן. לִפְטֹר אֶת הָעוֹמֵד בְּסוֹף שָׁבוּעַ שֵׁנִי. לְהַחְלִיט אֶת שֶׁנּוֹלַד לוֹ מִחְיָה אוֹ שֵׂעָר לָבָן, בַּתְּחִלָּה, בְּסוֹף שָׁבוּעַ רִאשׁוֹן, בְּסוֹף שָׁבוּעַ שֵׁנִי, לְאַחַר הַפְּטוּר. לְהַחְלִיט אֶת שֶׁנּוֹלַד לוֹ פִשְׂיוֹן, בְּסוֹף שָׁבוּעַ רִאשׁוֹן, בְּסוֹף שָׁבוּעַ שֵׁנִי, לְאַחַר הַפְּטוּר. לְהַחְלִיט אֶת הַהוֹפֵךְ כֻּלּוֹ לָבָן מִתּוֹךְ הַפְּטוּר. לִפְטֹר אֶת הַהוֹפֵךְ כֻּלּוֹ לָבָן מִתּוֹךְ הֶחְלֵט אוֹ מִתּוֹךְ הֶסְגֵּר. אֵלּוּ מַרְאוֹת נְגָעִים שֶׁכָּל נְגָעִים תְּלוּיִם בָּהֶן:

These four appearances [of Negaim] combine, one with the other, to exempt [one from impurity], to decide [that one is impure], or to quarantine [one of uncertain status]. [They combine] to quarantine that which remains [unchanged] at the end of the first week [from reporting the Nega]. [They combine] to exempt that which remains [unchanged] at the end of the second week. [They combine] to decide that which develops healthy skin [in the area of the Nega] or white hair, [whether] initially, at the end of the first week, at the end of the second week, [or] after the exemption. [They combine] to decide that which develops spreading, [whether] at the end of the first week, at the end of the second week, [or] after the exemption. [They combine] to decide that which turns completely white, [coming] from [the state of] exemption. [They combine] to exempt one who turns completely white, [coming] from [the state of] the decision [that he was impure] or from quarantine. These are the appearances of Negaim which all Negaim are based upon.

Mishnah 4ד׳

רַבִּי חֲנִינָא סְגַן הַכֹּהֲנִים אוֹמֵר, מַרְאוֹת נְגָעִים שִׁשָּׁה עָשָׂר. רַבִּי דוֹסָא בֶּן הַרְכִּינַס אוֹמֵר, מַרְאוֹת נְגָעִים שְׁלשִׁים וְשִׁשָּׁה. עֲקַבְיָא בֶן מַהֲלַלְאֵל אוֹמֵר, שִׁבְעִים וּשְׁנָיִם. רַבִּי חֲנִינָא סְגַן הַכֹּהֲנִים אוֹמֵר, אֵין רוֹאִים אֶת הַנְּגָעִים בַּתְּחִלָּה לְאַחַר הַשַּׁבָּת, שֶׁשָּׁבוּעַ שֶׁלּוֹ חָל לִהְיוֹת בְּשַׁבָּת. וְלֹא בַשֵּׁנִי, שֶׁשָּׁבוּעַ שֵׁנִי שֶׁלּוֹ חָל לִהְיוֹת בְּשַׁבָּת. וְלֹא בַשְּׁלִישִׁי לַבָּתִּים, שֶׁשָּׁבוּעַ שְׁלִישִׁי שֶׁלּוֹ חָל לִהְיוֹת בְּשַׁבָּת. רַבִּי עֲקִיבָא אוֹמֵר, לְעוֹלָם רוֹאִים. חָל לִהְיוֹת בְּתוֹךְ הַשַּׁבָּת, מַעֲבִירִין לְאַחַר הַשַּׁבָּת. וְיֵשׁ בַּדָּבָר לְהָקֵל וּלְהַחְמִיר:

Rabbi Chanania the vice of the priests says: The appearances of Negaim are sixteen. Rabbi Dosa ben Harkinas says: The appearances of Negaim are thirty-six. Akavia ben Mahalalel says: seventy-two. Rabbi Chanania the vice of the priests says: One may not examine the Negaim initially after Shabbat [in order to diagnose them] because then [the end of] his week [of impurity] will fall on Shabbat. And not on the second day [of the week] because then [the end of] his second week will fall on Shabbat. And not on the third day [of the week] for the case of [the Nega afflicting] houses, because then [the end of] its third week will fall on Shabbat. Rabbi Akiva says: One always examines. If [the end of the week] fell out on Shabbat, they would push off [the examination] until after Shabbat. And this matter has both leniency and stringency.