Sahih al-Bukhari 1585
Book 25: Hajj (Pilgrimage) · Narrated by `Aisha
Arabic
حَدَّثَنَا عُبَيْدُ بْنُ إِسْمَاعِيلَ، حَدَّثَنَا أَبُو أُسَامَةَ، عَنْ هِشَامٍ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتْ قَالَ لِي رَسُولُ اللَّهِ صلى الله عليه وسلم " لَوْلاَ حَدَاثَةُ قَوْمِكِ بِالْكُفْرِ لَنَقَضْتُ الْبَيْتَ ثُمَّ لَبَنَيْتُهُ عَلَى أَسَاسِ إِبْرَاهِيمَ ـ عَلَيْهِ السَّلاَمُ ـ فَإِنَّ قُرَيْشًا اسْتَقْصَرَتْ بِنَاءَهُ ـ وَجَعَلْتُ لَهُ خَلْفًا ". قَالَ أَبُو مُعَاوِيَةَ حَدَّثَنَا هِشَامٌ خَلْفًا يَعْنِي بَابًا.
English translation
Narrated `Aisha:Allah's Messenger (ﷺ) said to me, "Were your people not close to the Pre-Islamic period of ignorance, I would have demolished the Ka`ba and would have rebuilt it on its original foundations laid by Abraham (for Quraish had curtailed its building), and I would have built a back door (too)
Reference: Sahih al-Bukhari 1585, Book of Hajj (Pilgrimage). English translation by Dr. Muhammad Muhsin Khan.