Sahih al-Bukhari 1657
صحيح البخاري#1657SahihNarrated `Abdullah bin Mas`ud:I offered (only a) two rak`at prayer with the Prophet (at Mina), and similarly with Abu Bakr and with `Umar, and then you differed in opinions. Wish that I would be lucky enough to have two of the four rak`at accepted (by Allah)
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: 25:138