Where did Allah's Apostle (ﷺ) observe prayer? They said: At this very place. I, however, forgot to ask them about the (number of) rak'ahs that he observed.
Sahih Muslim Book 15, Hadith 438
← Previous Hadith Allah's Messenger, (ﷺ) entered the House, and Usama, Bilal and Uthman b. Talha were with him, and they kept the door closed for a considerable time. Then it was opened and I was the first to enter the House and meet Bilal, and I said: Where did Allah's Messenger (ﷺ) observe prayer? He said: Between these two front pillars. I, however, forgot to ask him the number of rak'ahs that he observed.

Sahih Muslim Book 15, Hadith 437 Next Hadith → Did Allah's Messenger (ﷺ) observe prayer in it? He said: Yes, he observed prayer between these two Yemenite pillars (pillars situated towards the side of Yemen).

Sahih Muslim Book 15, Hadith 439