To offer non-congregational As-Salat (the prayers) between the pillars

Narrated Ibn `Umar:

The Prophet (ﷺ) entered the Ka`ba along with Usama bin Zaid, `Uthman bin Talha and Bilal and remained there for a long time. When they came out, I was the first man to enter the Ka`ba. I asked Bilal "Where did the Prophet (ﷺ) pray?" Bilal replied, "Between the two front Pillars."

حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، قَالَ حَدَّثَنَا جُوَيْرِيَةُ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ دَخَلَ النَّبِيُّ صلى الله عليه وسلم الْبَيْتَ وَأُسَامَةُ بْنُ زَيْدٍ وَعُثْمَانُ بْنُ طَلْحَةَ وَبِلاَلٌ، فَأَطَالَ ثُمَّ خَرَجَ، وَكُنْتُ أَوَّلَ النَّاسِ دَخَلَ عَلَى أَثَرِهِ فَسَأَلْتُ بِلاَلاً أَيْنَ صَلَّى قَالَ بَيْنَ الْعَمُودَيْنِ الْمُقَدَّمَيْنِ‏.‏

Narrated Nafi`:

`Abdullah bin `Umar said, "Allah's Messenger (ﷺ) entered the Ka`ba along with Usama bin Zaid, Bilal and `Uthman bin Talha Al-Hajabi and closed the door and stayed there for some time. I asked Bilal when he came out, 'What did the Prophet (ﷺ) do?' He replied, 'He offered prayer with one pillar to his left and one to his right and three behind.' In those days the Ka`ba was supported by six pillars." Malik said: "There were two pillars on his (the Prophet's) right side."

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، قَالَ أَخْبَرَنَا مَالِكٌ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم دَخَلَ الْكَعْبَةَ وَأُسَامَةُ بْنُ زَيْدٍ وَبِلاَلٌ وَعُثْمَانُ بْنُ طَلْحَةَ الْحَجَبِيُّ فَأَغْلَقَهَا عَلَيْهِ وَمَكَثَ فِيهَا، فَسَأَلْتُ بِلاَلاً حِينَ خَرَجَ مَا صَنَعَ النَّبِيُّ صلى الله عليه وسلم قَالَ جَعَلَ عَمُودًا عَنْ يَسَارِهِ، وَعَمُودًا عَنْ يَمِينِهِ، وَثَلاَثَةَ أَعْمِدَةٍ وَرَاءَهُ، وَكَانَ الْبَيْتُ يَوْمَئِذٍ عَلَى سِتَّةِ أَعْمِدَةٍ، ثُمَّ صَلَّى‏.‏ وَقَالَ لَنَا إِسْمَاعِيلُ حَدَّثَنِي مَالِكٌ وَقَالَ عَمُودَيْنِ عَنْ يَمِينِهِ‏.‏