Two nezirim to whom an individual said: “I saw that one of you became tamei, but I don’t know which one of you” —- they [both] shave, and they bring [jointly] a sacrifice for tumah and a sacrifice for taharah, and [one of the nezirim] says: “If I am the one who is tamei, the sacrifice for tumah is mine and the sacrifice for taharah is yours; but if I am the one who is tahor, the sacrifice for taharah is mine and the sacrifice for tumah is yours.” They [then] count thirty days and bring [jointly] a sacrifice for taharah, and he says: “If I was the one who was tamei, the sacrifice for tumah was mine, the sacrifice for taharah was yours, and this is my sacrifice for taharah; but if I was the one who was tahor, the sacrifice for taharah was mine, the sacrifice for tumah was yours, and this is your sacrifice for taharah.”  [If] one of them died, R’ Yehoshua said: He should seek out someone from the street who will vow to be a nazir parallel to him, and say: “If I was tamei you are a nazir at once, but if I was tahor you are a nazir after thirty days.” They [then] count thirty days, and bring [jointly] a sacrifice for tumah and a sacrifice for taharah. And he says: “If I am the one who was tamei, the sacrifice for tumah is mine and the sacrifice for taharah is yours; but if I am the one who was tahor, the sacrifice for taharah is mine and the sacrifice for tumah [is offered] out of doubt.” They [then] count thirty days, and bring [jointly] the sacrifice for taharah, and he says: “If I am the one who was tamei, the sacrifice for tumah was mine, the sacrifice for taharah was yours, and this is my sacrifice for taharah; but if I am the one who was tahor, the sacrifice for taharah was mine, the sacrifice for tumah was [offered] out of doubt, and this is your sacrifice for taharah.”  Ben Zoma said to him: “And who will listen to him to vow to be a nazir parallel to him?” Rather, he brings a bird as a sin-offering and an animal as a burnt-offering, and says: “If I was tamei, the sin-offering is part of my obligation and the burnt-offering is voluntary; but if I was tahor, the burnt-offering is part of my obligation and the sin-offering is out of doubt.” And he [then] counts thirty days, and brings the sacrifice for taharah, and says: “If I was tamei, the first burnt-offering was voluntary and this one is for my obligation; but if I was tahor, the first burnt-offering was for my obligation and this one is voluntary, and this is the rest of my offering.” R’ Yehoshua said: It results that this one brings his offerings piecemeal! But the Sages agreed with Ben Zoma.

A nazir who was in doubt whether he was tamei and in doubt [also] whether he was a confirmed [metzora] —- he may eat sacred foods after sixty days, and drink wine and contaminate himself with the tumah of the dead after one hundred and twenty days, because shaving for the affliction [of tzaraas] overrides shaving for nezirus when [the former] is certain, but when it is doubtful it does not override it.