Nedarim

An objection is raised: If a woman made a vow of neziruth, set aside an animal, and then her husband disallowed her: she must bring the sin-offering of a bird, but not burnt-offering of a bird.  But if you say, a sacrifice is not incurred for half [the period of] neziruth, why must she bring the sin-offering of a bird? — What then: a sacrifice is incurred for half [the period of] neziruth — then she should bring three animals, [viz.,] a sin-offering, a burnt offering and a peace-offering?  But after all no sacrifice is incurred for half neziruth; whilst, as for the sin-offering of a bird which she must bring, that is because such is due even in case of doubt. He [further] objected: If a woman made a vow of a nazirite and became defiled, and then her husband disallowed her, she must bring the sin-offering of a bird, but not the burnt-offering of a bird. But if you rule, he can annul [only] in respect of what involves self-denial, but cannot annul that which involves no self-denial,