We are commanded to practice the Torah-mandated procedure in the event that a vow is to be annulled.
(This commandment is somewhat based on the verse [Numbers 30:3] "he shall not profane his word," from which the Sages deduce that the one who enacted the vow may not profane his own word, but others – such as a sage or rabbinical court – may do so. Nevertheless, the Talmud says that the "annulment of vows flies in the air, with no [explicit biblical] support...")
The Torah explicitly tells us that a husband and father can nullify vows, and tradition teaches that a sage, too, has the power to do so.
"He shall let the locks of hair on his head grow"—Numbers 6:5.
A nazirite is commanded to allow the hair on his head to grow unimpeded.
"A razor shall not go over his head"—Numbers 6:5.
A nazirite must not shave – even one hair off – his head with a razor. This prohibition also precludes another from shaving the nazirite's head.
