יֵשׁ בְּשֵׂעָר לָבָן מַה שֶּׁאֵין בְּמִחְיָה, וְיֵשׁ בְּמִחְיָה מַה שֶּׁאֵין בְּשֵׂעָר לָבָן. שֶׁשֵּׂעָר לָבָן מְטַמֵּא בַשְּׁחִין וּבַמִּכְוָה, בִּמְכֻנָּס וּבִמְפֻזָּר, בִּמְבֻצָּר וְשֶׁלֹּא בִמְבֻצָּר. יֵשׁ בְּמִחְיָה, שֶׁהַמִּחְיָה מְטַמָּא בַקָּרַחַת וּבַגַּבַּחַת, הֲפוּכָה וְשֶׁלֹּא הֲפוּכָה, וּמְעַכֶּבֶת אֶת הַהוֹפֵךְ כֻּלּוֹ לָבָן, וּמְטַמָּא בְכָל מַרְאֶה, מַה שֶּׁאֵין כֵּן בְּשֵׂעָר לָבָן:
There are [laws] by white hair that a healthy patch of skin does not have, and there are [laws] by a healthy patch of skin that white hair does not have. For white hair makes [the <i>Nega</i>] impure if it was in [the area of] a boil or burn, [if the hair was] concentrated or scattered, [if it was] surrounded [by the <i>Nega</i>] or not surrounded. There are [also unique laws] by a healthy patch of skin, for a healthy patch of skin makes a <i>Karachat</i> [<i>Nega</i> that balds the back of the head] or <i>Gabachat</i> [<i>Nega</i> that balds the top of the head], whether [the patch] was preexisting or not preexisting, and it prevents [purification of] someone who has turned completely white [by a <i>Nega</i>] and makes impure with any appearance, which is not true by white hair.
Sefer HaChinukh
From its laws is, for example, that which they, may their memory be blessed, said that a woman that has given birth does not bring her sacrifice on the fortieth day for a male and on the eightieth day for a female, but rather on the morrow, which is the forty-first day, and likewise the eighty-first day, as it is stated, "On the completion of the days of purification" - meaning to say that they are totally completed. And if she brought it during the days of completion, she has not fulfilled her obligation (Zevachim 112b). If the time has passed and she did not bring her atonement, she brings it after the time. And the whole time that she has not brought it, she is forbidden to eat consecrated foods - and as they, may their memory be blessed, said (Mishnah Negaim 4:3), "[When] she brought her atonement, she eats from consecrated foods." And all those lacking atonement have the same status in this regard. And [regarding] all those that are obligated to bring a sacrifice, we may not bring their sacrifice without their consent; except for [the sacrifice of] those lacking atonement, which does not require consent of the owners (Nedarim 35b). And the rest of its details are in Tractate Niddah (see Mishneh Torah, Laws of Offerings for Those with Incomplete Atonement 1).
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