Sahih Bukhari
Sahih Bukhari Volume 008, Book 075, Hadith Number 347.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 75. Invocations
Narated By 'Aisha : The Prophet heard a man reciting (the Qur'an) in the mosque. He said," May Allah bestow His Mercy on him, as he made me remember such and-such Verse which I had missed in such-and-such Sura."