Riyad as-Salihin 1886

The Prophet (sallallahu alayhi wa sallam) said, “There is a tree in Jannah that is so huge that if a rider of a swift horse has to cover its distance from one end to another in one hundred years, he will not be able to do so.”Another narration from Abu Hurayrah (radiyallahu anhu) is: The Messenger of Allah (sallallahu alayhi wa sallam) said, “A rider will not be able to cross its (the tree’s) shade even after travelling for one hundred years.”