Anas narrated that the Prophet said:
"Indeed in Paradise there is a tree under whose shade a rider can travel for one hundred years without stopping. Recite if you wish: And in shave extended. And water flowing constantly." (ID)
English reference (ID): Vol. 5, Book 44, Hadith 3293 (ID)
Arabic reference (ID): Book 47, Hadith 3604 (ID)