I entered Paradise and found myself by a river, by its edges were tents of pearls.
Then I tapped with my hands where the water was running, and there was then a beautiful smell of Musk.
I asked, "What is this O Gabriel?"
He said, "This is Kawthar (river in Paradise) which Allah has given to you." (Sahihi al-Jami)
"The similitude of knowledge without action is a book ladened donkey." (Qur'an, 62:5)