Messenger of Allah ﷺ entered Makkah through its upper part and he was riding his she-camel. Usãma bin Zaid was his Companion-rider behind him (on the same she-camel). In his company were Bilãl and 'Uthmãn bin Talha, who was one of the Al-Hajabah (who keep the key of the gate of the Ka'bah). When he made his she-camel kneel down in the Mosque (i.e., Al-Masjid al-Haram), he ordered him (i.e., 'Uthman) to bring the key of the Ka'bah. Then Messenger of Allah ﷺ entered the Ka'bah along with 'Usãma bin Zaid, Bilãl and 'Uthmãn bin Talha, and he stayed in it for a long period and then came out. The people rushed (to get in) and ʿAbdullãh bin 'Umar was the first to enter and he found Bilãl standing behind the door. Ibn ʿUmar asked Bilãl, "Where did Messenger of Allah ﷺ offer the Salat (prayer)?" Bilãl showed him the place where he ﷺ had offered Salat (prayer). ʿAbdullah later on said, "I forgot to ask Bilãl how many prostrations (i.e., Rak'a) the Prophet offered."  

أَنَّ رَسُولَ اللَّهِ ﷺ أَقْبَلَ يَوْمَ الْفَتْحِ مِنْ أَعْلَى مَكَّةَ عَلَى رَاحِلَتِهِ مُرْدِفًا أُسَامَةَ بْنَ زَيْدٍ وَمَعَهُ بِلاَلٌ وَمَعَهُ عُثْمَانُ بْنُ طَلْحَةَ مِنَ الْحَجَبَةِ حَتَّى أَنَاخَ فِي الْمَسْجِدِ فَأَمَرَهُ أَنْ يَأْتِيَ بِمِفْتَاحِ الْبَيْتِ فَدَخَلَ رَسُولُ اللَّهِ ﷺ وَمَعَهُ أُسَامَةُ بْنُ زَيْدٍ وَبِلاَلٌ وَعُثْمَانُ بْنُ طَلْحَةَ فَمَكَثَ فِيهِ نَهَارًا طَوِيلاً ثُمَّ خَرَجَ فَاسْتَبَقَ النَّاسُ فَكَانَ عَبْدُ اللَّهِ بْنُ عُمَرَ أَوَّلَ مَنْ دَخَلَ فَوَجَدَ بِلاَلاً وَرَاءَ الْبَابِ قَائِمًا فَسَأَلَهُ أَيْنَ صَلَّى رَسُولُ اللَّهِ ﷺ فَأَشَارَ لَهُ إِلَى الْمَكَانِ الَّذِي صَلَّى فِيهِ قَالَ عَبْدُ اللَّهِ فَنَسِيتُ أَنْ أَسْأَلَهُ كَمْ صَلَّى مِنْ سَجْدَةٍ  

[Machine] The Messenger of Allah ﷺ rode on the day of the conquest on a camel belonging to Usama ibn Zaid, and Usama rode alongside the Messenger of Allah ﷺ . With them were Bilal and Uthman ibn Talha. When they reached the Kaaba, Uthman ibn Talha was sent for and he brought the key to the Kaaba and opened it. The Messenger of Allah ﷺ , along with Usama, Uthman ibn Talha, and Bilal, entered the Kaaba and stayed inside for a long time. The door of the Kaaba was then closed upon them. The Messenger of Allah ﷺ then came out and the people crowded towards the Kaaba. Abdullah ibn Umar and others were ahead of them. Abdullah ibn Umar asked Bilal, "Where did the Messenger of Allah ﷺ pray?" Bilal replied, "I saw him pray in that place," without specifying how many prayers he performed.  

أَنَّ رَسُولَ اللهِ ﷺ أَقْبَلَ يَوْمَ الْفَتْحِ عَلَى نَاقَةٍ لِأُسَامَةَ بْنِ زَيْدٍ وَأُسَامَةُ رَدِيفُ رَسُولِ اللهِ ﷺ وَمَعَهُ بِلَالٌ وَعُثْمَانُ بْنُ طَلْحَةَ فَلَمَّا جَاءَ الْبَيْتَ أَرْسَلَ عُثْمَانَ بْنَ طَلْحَةَ فَجَاءَهُ بِمِفْتَاحِ الْبَيْتِ فَفَتَحَهُ فَدَخَلَ رَسُولُ اللهِ ﷺ وَأُسَامَةُ وَعُثْمَانُ بْنُ طَلْحَةَ وَبِلَالٌ فَمَكَثُوا فِي الْبَيْتِ طَوِيلًا وَأَغْلَقُوا عَلَيْهِمُ الْبَيْتَ ثُمَّ خَرَجَ رَسُولُ اللهِ ﷺ فَابْتَدَرَ النَّاسُ الْبَيْتَ فَسَبَقَهُمْ عَبْدُ اللهِ بْنُ عُمَرَ وَآخَرُ مَعَهُ فَسَأَلَ عَبْدُ اللهِ بْنُ عُمَرَ بِلَالًا أَيْنَ صَلَّى رَسُولُ اللهِ ﷺ؟ «فَأَرَاهُ بِلَالٌ حَيْثُ صَلَّى» فَلَمْ يَسْأَلْ كَمْ صَلَّى