Sunan Ibn Majah 217

It was narrated that Abu Hurairah said:"The Messenger of Allah said: 'Learn the Qur'an, recite it and go to bed, for the likeness of the Qur'an and the one who learns it and acts upon it is that of a sack filled with musk, which spreads its fragrance everywhere. And the likeness of one who learns it then goes to bed with it in his heart is that of a sack that is tied up from which no fragrance comes out