وَعَنْ أَبِي هُرَيْرَةَ
قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «تَعَلَّمُوا الْقُرْآنَ فَاقْرَءُوهُ فَإِن مثل الْقُرْآن لمن تعلم وَقَامَ بِهِ كَمثل جراب محشو مسكا يفوح رِيحُهُ كُلَّ مَكَانٍ وَمَثَلُ مَنْ تَعَلَّمَهُ فَرَقَدَ وَهُوَ فِي جَوْفِهِ كَمَثَلِ جِرَابٍ أُوكِئَ عَلَى مسك»
He reported God’s messenger as saying, “Learn and recite the Qur’an, 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.” Tirmidhi, Nasai and Ibn Majah transmitted it.
Mishkat al-Masabih 2048, Book 9, The Excellent Qualities of the Qur'an, Hadith 34. 1 min read