Sahih Bukhari
Sahih Bukhari Volume 006, Book 061, Hadith Number 546.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 61. Virtues of The Qur'an
Narrated By Uthman bin Affan : The Prophet said, "The most superior among you (Muslims) are those who learn the Qur'an and teach it."