Sahih al-Bukhari 724
صحيح البخاري#724SahihNarrated Anas bin Malik:I arrived at Medina and was asked whether I found any change since the days of Allah's Messenger (ﷺ). I said, "I have not found any change except that you do not stand in alignment in your prayers
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: 10:118