From Sahih Bukhari (Hadith 5038):
Narrated Aisha:Allah's Messenger (ﷺ) 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
Reference: Bukhari 5038