1)
What will be the Din if the Nega has spread or if two yellow hairs appear on it after the seven days?
1.
Rashi: It is Tamei.
2)
Why does the Torah write "ve'Lo Hayah bo Se'or Tzahov" and not "Lo Hafach bo Se'or Tzahov" like it did by Nega'im?
1.
Sifra: To teach us that it is Tamei even the yellow hairs preceded the Nesek.
