Sahih al-Bukhari 468
صحيح البخاري#468SahihNarrated Nafi`:Ibn `Umar said, "The Prophet (ﷺ) arrived at Mecca and sent for `Uthman bin Talha. He opened the gate of the Ka`ba and the Prophet, Bilal, Usama bin Zaid and `Uthman bin Talha entered the Ka`ba and then they closed its door (from inside). They stayed there for an hour, and then came out." Ibn `Umar added, "I quickly went to Bilal and asked him (whether the Prophet (ﷺ) had prayed). Bilal replied, 'He prayed in it.' I asked, 'Where?' He replied, 'Between the two pillars.' "Ibn `Umar added, "I forgot to ask how many rak`at he (the Prophet) had prayed in the Ka`ba
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: 8:116