For the source text click/tap here: Nazir 60
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There is a good deal of background information that will help (some) in understanding this mishnah. The topic of the mishnah is someone who is not only a doubtfully defiled nazirite, but a doubtful metzorah, one who has scale disease (which I will, for convenience sake, call leprosy). The process of the “leper” is as follows. When the priest checks him and decides that he does have the disease, he sits outside of the camp for seven days.
A nazirite who was in doubt whether he had been defiled and in doubt whether he had been a confirmed leper, may eat consecrated food after sixty days, and drink wine and come into contact with the dead after one hundred and twenty days, since shaving on account of leprosy overrides [the prohibition against] the shaving of the nazirite only when [the leprosy] is certain, but when it is doubtful it does not override it.
The mishnah explains what is to happen in this situation. First of all, he must wait thirty days after he has been purified from having potentially come into contact with the dead and then he may shave his first shaving for leprosy. He could not shave earlier for he may not have been a leper and he may have been a pure nazirite in which case the leprosy shaving would not override the prohibition for a nazirite to shave, as the mishnah states at the end. Then he counts another seven days at which point he normally could shave his second leprosy shaving, but he cannot for the same reason.
We explore the notion of askesis or self discipline and asceticism in late antiquity among Jews and Early Church Fathers.