It was the custom of scholars [that] as long as one's daughter had not left him, he would say to her: “All nedarim which you have made in my house are revoked.” And so, too, the husband —- before she would come under his authority —- would say to her: “All nedarim which you have made prior to coming under my authority are revoked,” for once she comes under his authority, he cannot revoke [them].

A bogeres who had waited twelve months —- or a widow, thirty days —- R' Eliezer says: Since her husband is responsible for her sustenance, he can revoke [her nedarim]; the Sages, however, say: A husband cannot revoke [her nedarim] until she has entered his authority.