Revocation of nedarim [is valid] the entire day. This fact can be lenient or stringent. How? If she made a neder on the night of Sabbath, he can revoke it during the night of the Sabbath, or on the Sabbath day before nightfall. If she vowed just before dark, he must revoke it before nightfall, for if it became dark, and he had not revoked it, he can no longer revoke [it].

1. These are nedarim that he can revoke —- those that involve self-denial: “If I bathe,” or “If I do not bathe”; “If I adorn myself,” or “If I do not adorn myself.” R' Yose said: These are not nedarim of self-denial.