Sahih Bukhari
Sahih Bukhari Volume 004, Book 055, Hadith Number 642.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 55. Prophets
Narated By 'Ali : I heard the Prophet saying, "Mary, the daughter of 'Imran, was the best among the women (of the world of her time) and Khadija is the best amongst the women. (of this nation)."