Mus'ab bin Sa'd narrated that his father said:
"The Messenger of Allah said: 'The best of you is the one who learns the Qur'an and teaches it.' " 'Then he (Mus'ab) took me (the narrator) by the hand and made me sit here, and I started to teach Qur'an.'"
English reference: Vol. 1, Book 1, Hadith 213
Arabic reference: Book 1, Hadith 218