Mishkat al-Masabih 8 The Excellent Qualities of the Qur’an كتاب فضائل القرآن 34

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» . رَوَاهُ التِّرْمِذِيّ وَالنَّسَائِيّ وَابْن مَاجَه

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.