It was narrated that 'Uthmaan bin 'Affan said:
"The Messenger of Allah said: 'The most excellent of you is the one who learns the Qur'an and teaches it.'" (RU)
English reference (RU): Vol. 1, Book 1, Hadith 212 (RU)
Arabic reference (RU): Book 1, Hadith 217 (RU)