Sahih al-Bukhari 3253
صحيح البخاري#3253SahihNarrated Abu Huraira:The Prophet (ﷺ) said "There is a tree in Paradise (which is so big and huge that) a rider could travel in its shade for a hundred years. And if you wish, you can recite:--'In shade long extended..' (56. 30) and a place in Paradise equal to an arrow bow of one of you, is better than (the whole earth) on which the sun rises and sets
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 59:63