Abdullah b. Umar reported that he reached the Ka'ba and Allah's Apostle ﷺ had entered therein, and Bilal and Usama too. 'Uthman b. Talha closed the door to them, and they stayed there for a considerable time, and then the door was opend 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.

وَحَدَّثَنِي حُمَيْدُ بْنُ مَسْعَدَةَ، حَدَّثَنَا خَالِدٌ، - يَعْنِي ابْنَ الْحَارِثِ - حَدَّثَنَا عَبْدُ اللَّهِ، بْنُ عَوْنٍ عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّهُ انْتَهَى إِلَى الْكَعْبَةِ وَقَدْ دَخَلَهَا النَّبِيُّ ﷺ وَبِلاَلٌ وَأُسَامَةُ وَأَجَافَ عَلَيْهِمْ عُثْمَانُ بْنُ طَلْحَةَ الْبَابَ قَالَ فَمَكَثُوا فِيهِ مَلِيًّا ثُمَّ فُتِحَ الْبَابُ فَخَرَجَ النَّبِيُّ ﷺ وَرَقِيتُ الدَّرَجَةَ فَدَخَلْتُ الْبَيْتَ فَقُلْتُ أَيْنَ صَلَّى النَّبِيُّ ﷺ قَالُوا هَا هُنَا . قَالَ وَنَسِيتُ أَنْ أَسْأَلَهُمْ كَمْ صَلَّى.