Sifrei Devarim 274/ספרי דברים ער״ד

2“Regarding the plague-sign” (Dt. 24:8)—this is the white hair [in the bright spot].

3“Of scaly flesh” (Dt. 24:8)—this is an area of livid flesh.2. I might infer only that[the rule applies at the onset of the disease,]before the sign is implicated in uncleanness.But how do I know[to apply it] once the sign has been implicated in uncleanness,and even after the victim is [cleansed and]permitted [to re-enter the camp]?The Teaching states:“To scrupulously follow and do” (Dt. 24:8)—[from the onset till its conclusion].

43. I might infer only that[this rule applies] to plague-signs afflicting humans.How do I know that it appliesto plague-signs of garmentsand plague-signs of houses?The Teaching states:“According to all that the levitical Priests instruct you” (Dt. 24:8)—[including plague-signs afflicting garments and houses as well].

54. I might infer only that[this rule applies] once the victim is confirmed to be unclean.How do I know that it applies [as well]during the period of quarantine [prior to the declaration]?The Teaching states:“As I commanded them” (Dt. 24:8).