Sahih al-Bukhari 6396
صحيح البخاري#6396SahihNarrated `Ali bin Abi Talib:We were in the company of the Prophet (ﷺ) on the day (of the battle) of Al-Khandaq (the Trench). The Prophet said, "May Allah fill their (the infidels') graves and houses with fire, as they have kept us so busy that we could not offer the middle prayer till the sun had set; and that prayer was the `Asr prayer
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: 80:91