Sahih al-Bukhari 4007
صحيح البخاري#4007SahihNarrated Az-Zuhri:I heard `Urwa bin Az-Zubair talking to `Umar bin `Abdul `Aziz during the latter's Governorship (at Medina), he said, "Al-Mughira bin Shu`ba delayed the `Asr prayer when he was the ruler of Al-Kufa. On that, Abu Mas`ud. `Uqba bin `Amr Al-Ansari, the grand-father of Zaid bin Hasan, who was one of the Badr warriors, came in and said, (to Al-Mughira), 'You know that Gabriel came down and offered the prayer and Allah's Messenger (ﷺ) prayed five prescribed prayers, and Gabriel said (to the Prophet (ﷺ) ), "I have been ordered to do so (i.e. offer these five prayers at these fixed stated hours of the day)
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: 64:58