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Steinsaltz tells us:
a nazir is prohibited from coming into contact with a dead body, as well as cutting his hair and eating or drinking grape products. The Mishna on our daf teaches that there are differences between these various prohibitions:
If a nazir becomes tameh or if his hair is cut, he must begin his nezirut anew, but if he drinks wine his nezirut continues even though he transgressed a prohibition.
There is a difference between these two laws. Coming into contact with the dead obligates the nazir to bring a sacrifice and start his nezirut from the beginning; having his hair cut does not obligate him to bring a sacrifice, and at most he will need to count 30 days, even if he had accepted a lengthier nezirut on himself.
The prohibitions against becoming tameh or cutting hair may be pushed aside by other considerations – e.g., taking care of a met mitzva (a dead person who has no one to bury him) or a metzora (a leper) who is obligated to shave his body upon recovering from his tzara’at. There are no exceptions to the rule about drinking wine, which will always be forbidden.
We further explore the concept of tunas Meis comparing Nazir with Kehunah.
Does impurity apply to gentiles?