Nazir 3:7-4:1
Nazir 3:7
Let’s say that a person has two sets of witnesses testifying about the terms of his nezirus: one set says he committed to two terms of nezirus and the other set says he committed to five. Beis Shammai say that the testimony is split, with the result that the person in question does not observe nezirus at all. Beis Hillel say that five includes two; since the witnesses agree on that much, he observes two terms of nezirus.
Nazir 4:1
Let’s say that one person says, “I am a nazir.” His friend hears and says, “Me, too” and another person says, “Me, too.” In such a case, each of them is a nazir. If the first person is released from his vow, all of them are released. If the last one is released, only he is permitted; the others are still prohibited. If one person says, “I am a nazir” and his friend hears and says, “My mouth is like his mouth and my hair is like his hair,” he is a nazir. If a man says, “I am a nazir” and his wife hears and says, “Me, too,” he can annul her vow but his own still stands. If a woman says, “I am a nazir” and her husband says, “Me, too,” he cannot annul her vow (because he has already confirmed it).