'Abdullah bin 'Umar (RA) reported that he reached the Ka’bah and Allah's Apostle (ﷺ) had entered therein, and Bilal (RA) and Usama too. 'Uthman bin Talha closed the door for them, and they stayed there for a considerable time, and then the door was opened and Allah's Apostle (ﷺ) came out, and I went upstairs and entered the House and said: 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.