Mishkat al-Masabih #2047

He reported God's messenger as saying, “Learn and recite the Qur’ān, for to one who learns, recites and uses it in prayer at night it is like a bag filled with musk whose fragrance diffuses itself everywhere; and he who learns it and goes to sleep having it within him is like a bag with musk tied up in it.” Tirmidhī, Nasā’ī and Ibn Mājah transmitted it.