Volume 7 · Book 61 · Hadith 558
Narrated Aisha: Allah's Apostle heard a man reciting the Qur'an at night, and said, "May Allah bestow His Mercy on him, as he has reminded me of such-and-such Verses of such-and-such Suras, which I was caused to forget."
— Sahih Bukhari, Volume 7, Book 61: Virtues of the Qur'an, Hadith #558