Sahih al-Bukhari 596
صحيح البخاري#596SahihNarrated Jabir bin `Abdullah:On the day of Al-Khandaq (the battle of trench.) `Umar bin Al-Khattab came cursing the disbelievers of Quraish after the sun had set and said, "O Allah's Messenger (ﷺ) I could not offer the `Asr prayer till the sun had set." The Prophet (ﷺ) said, "By Allah! I, too, have not prayed." So we turned towards Buthan, and the Prophet (ﷺ) performed ablution and we too performed ablution and offered the `Asr prayer after the sun had set, and then he offered the Maghrib 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: 9:71