Sahih al-Bukhari 3511
صحيح البخاري#3511SahihNarrated `Abdullah bin `Umar:I heard Allah's Messenger (ﷺ) on the pulpit saying, "Verily, afflictions (will start) from here," pointing towards the east, "whence the side of the head of Satan comes out
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: 61:21