A new mishnah: when witnesses come to court to testify about another person's vow of nezirut. Plus contradictory witnesses. With a dispute between Beit Hillel and Beit Shammai on how to square the contradictions. Also, moving on to the new chapter, 4: another new mishnah: where one person takes a vow as a nazir, and subsequent people say that they each are too, then they're all nezirim... except that if the first person is released from nezirut, then those who said "and I!" are no longer bound either. Likewise, other wordings that indicate the same. Plus, the amount of time it takes to greet another is the limit on how quickly others chime in to the first person's vow. Note the discussion between R. Yehudah HaNasi and Resh Lakish.