Sahih al-Bukhari 2850
صحيح البخاري#2850SahihNarrated Urwa bin Ja'd:The Prophet (ﷺ) said, "Good will remain (as a permanent quality) in the foreheads of horses till the Day of Resurrection
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: 56:66