Sahih al-Bukhari 1228
صحيح البخاري#1228SahihNarrated Abu Huraira.:Once Allah's Messenger (ﷺ) offered two rak`at and finished his prayer. So Dhul-Yadain asked him, "Has the prayer been reduced or have you forgotten?" Allah's Messenger (ﷺ) said, "Has Dhul-Yadain spoken the truth?" The people replied in the affirmative. Then Allah's Messenger (ﷺ) stood up and offered the remaining two rak`at and performed Taslim, and then said Takbir and performed two prostrations like his usual prostrations, or a bit longer, and then got up
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: 22:5