Sahih Bukhari
Sahih Bukhari Volume 008, Book 078, Hadith Number 691.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 78. Oaths and Vows
Narated By 'Aisha : The Prophet said, "Whoever vowed to be obedient to Allah, must be obedient to Him; and whoever vowed to be disobedient to Allah, should not be disobedient to Him."