Salim b. Abdullah reported his father (Allah be pleased with him) saying:
I saw Allah's Messenger (ﷺ) entering the Ka'ba, and Usama b. Zaid, Bilal and 'Uthman b. Talha were along with him, but none (else) entered therein along with them. Then the door was closed for them from within. 'Abdullah b. Umar (Allah be pleased with them) said: Bilal and Uthman b. Talha informed me that Allah's Messenger (ﷺ) observed prayer in the interior of the Ka'ba between the two Yemenite pillars.
‘Abdullāh ibn ‘Umar (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) entered the House along with Usāma ibn Zayd, Bilāl, and ‘Uthmān ibn Talha. They closed the door from within, and, as they opened it, I was the first to get into it and…
دَخَلَ رَسُولُ اللَّهِ صلى الله عليه وسلم الْبَيْتَ هُوَ وَأُسَامَةُ بْنُ زَيْدٍ، وَبِلاَلٌ، وَعُثْمَانُ بْنُ طَلْحَةَ، فَأَغْلَقُوا عَلَيْهِمْ فَلَمَّا فَتَحُوا، كُنْتُ أَوَّلَ مَنْ وَلَجَ، فَلَقِيتُ بِلاَلاً…