Sahih al-Bukhari 2622
صحيح البخاري#2622SahihNarrated Ibn `Abbas:The Prophet (ﷺ) said, "The bad example is not for us. He who takes back his present is like a dog that swallows back its vomit
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: 51:54