كتاب الحج
15  
The Book of Pilgrimage
(70)
Chapter: The wall and the door of the Ka'bah
(70)
باب جَدْرِ الْكَعْبَةِ وَبَابِهَا ‏‏
Sahih Muslim 1333 k

'A'isha reported:

I asked Allah's Messenger (ﷺ) about Hijr, and the rest of the hadith is the same. I also said: Why is it that the door has been made on a higher level, and one cannot (get into it) but with the help of a ladder? The rest of the hadith is the same as reported above and the concluding words are: (I do not change it) out of the apprehension that their hearts may disapprove of it."
وَحَدَّثَنَاهُ أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، قَالَ حَدَّثَنَا عُبَيْدُ اللَّهِ، - يَعْنِي ابْنَ مُوسَى - حَدَّثَنَا شَيْبَانُ، عَنْ أَشْعَثَ بْنِ أَبِي الشَّعْثَاءِ، عَنِ الأَسْوَدِ بْنِ يَزِيدَ، عَنْ عَائِشَةَ، قَالَتْ سَأَلْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم عَنِ الْحِجْرِ ‏.‏ وَسَاقَ الْحَدِيثَ بِمَعْنَى حَدِيثِ أَبِي الأَحْوَصِ وَقَالَ فِيهِ فَقُلْتُ فَمَا شَأْنُ بَابِهِ مُرْتَفِعًا لاَ يُصْعَدُ إِلَيْهِ إِلاَّ بِسُلَّمٍ وَقَالَ ‏ "‏ مَخَافَةَ أَنْ تَنْفِرَ قُلُوبُهُمْ ‏"‏ ‏.‏
Reference : Sahih Muslim 1333k
In-book reference : Book 15, Hadith 454
USC-MSA web (English) reference : Book 7, Hadith 3088
  (deprecated numbering scheme)