Sunan Ibn Majah, Chapter: The Book of the Sunnah

"The Messenger of Allah (saw) came out of one of his apartments one day and entered the mosque, where he saw two circles, one reciting Qur'an and supplicating to Allah, and the other learning and teaching. The Prophet (saw) said: 'Both of them are good. These people are reciting Qur'an and supplicating to Allah, and if He wills He will give them, and if He wills He will withhold from them. And these people are learning and teaching. Verily I have been sent as a teacher.' Then he sat down with them." (Da'if)