Sahih al-Bukhari 3995
صحيح البخاري#3995SahihNarrated Ibn `Abbas:The Prophet (ﷺ) said on the day (of the battle) of Badr, "This is Gabriel holding the head of his horse and equipped with arms for the battle
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: 64:46