What are the connotations of "Keiheh ha'Nega"?
Sifra: It means that the Nega has becomes weaker - but that it is still in the realm of the four appearances (not less white than the membrane of an egg - otherwise, even if it would have spread it would be Tahor and the following statement ["ve'Lo Fasah ha'Nega ... "] would be superfluous - Torah Temimah).
What is the definition of "Mispachas"?
Rashi: "Mispachas" is the name of a Tahor plague.
Is a different Kohen permitted to examine the Nega after the Hesger?
Sifra: The 'Hey' in "ha'Kohen" implies that it is the same Kohen who must examine the Nega after the Hesger. 1
See Torah Temimah, note 36.
What if the Nega has retained its appearance or has spread at the end of the second week?
Rashi #1: If the Nega has retained its appearance or has spread at the end of the second week, the Kohen declares the Metzora Tamei Muchlat. 1
Rashi #2 (in Megilah, 8b), Ramban and Da'as Zekenim (both citing Nega'im, 1:3) 2 , Hadar Zekenim (citing Megilah 8bX): As long as the Nega did not spread, it is Tahor. 3
As implied by the words of the Pasuk. See Oznayim la'Torah, that nevertheless, this explanation clashes with a number of Mishnayos in Nega'im.
Moshav Zekenim: R. Shimshon (in Nega'im 1:3 DH she'Kol) learns this from the Sifra.
Ramban: Even if it went from white like Sid ha'Heichal to white like snow. And the reason the Torah writes "Keiheh" and not 'Amad be'Einav' is to teach us that even if the Nega became dimmer, if it has spread, it is Tamei. Da'as Zekenim - or to teach us that, even if it became dimmer, we do not consider it a new Nega.
Seeing as the Kohen declares the Metzora Tahor, why do he and his clothes need to be Toveled?
Rashi: Because someone who requires Hesger is considered Tamei. X
What are the connotations of "Vetaher"? From which degree of Tum'ah are his clothes Tahor?
Sifra: They are Tahor from Tum'as Mishkav u'Moshav and from Tum'as Bi'ah (being Metamei someone or something under the same roof). 1
Why does the Torah write "Vetaher" (implying the past), and not "Veyit'har" (implying the furure)?
Megilah, 8b: To teach us that, even if the Nega subsequently spreads, he will only be Tamei from now on, but not retroactively, and whatever was with him or with his clothes in the same room when he was a Musgar is Tahor.
