'Abdullah bin 'Umar (RA) reported that he reached the Ka’bah and Allah's Apostle ( صلی اللہ علیہ وسلم ) 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 ( صلی اللہ علیہ وسلم ) came out, and I went upstairs and entered the House and said: Where did Allah's Apostle ( صلی اللہ علیہ وسلم ) observe prayer? They said: At this very place. I, however, forgot to ask them about the (number of) rak'ahs that he observed.