The nazirite vow required Temple offerings to close properly, and its practice as a live legal institution effectively ended with the Temple's destruction in 70 CE, though the Mishnah devotes an entire tractate, Nazir, to working through its details with the same thoroughness given to laws still in force, preserving the institution in rabbinic memory and study long after it could be performed.
Rabbinic sources record real historical examples from the Second Temple period, including reports that Queen Helena of Adiabene, a royal convert to Judaism, took a nazirite vow, and that figures kept the vow as an act of gratitude or penitence, suggesting it functioned in practice as a serious but not uncommon expression of devotion rather than an obscure legal curiosity. Rabbinic opinion on the vow's ultimate value was notably divided: some sources treat the nazirite as praiseworthy, a model of ascetic self discipline, while others, drawing on the requirement that the closing offering includes a sin offering, read the vow as itself implying something faintly regrettable, a person having needed to bind themselves against temptations an ideally righteous person would resist without a vow at all, a tension the Talmud discusses without fully resolving. The institution has no equivalent standing in later Jewish practice, though its themes of voluntary, time bound ascetic consecration echo in some later devotional customs.