Sahih al-Bukhari 7244
صحيح البخاري#7244SahihNarrated Abu Huraira:Allah's Messenger (ﷺ) said, "But for the emigration, I would have been one of the Ansar: and if the people took their way in a valley (or a mountain pass), I would take the Ansar's valley or the mountain pass
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: 94:19