Language:
كتاب فرض الخمس
57  
One-fifth of Booty to the Cause of Allah (Khumus)
(4)
Chapter: What has been said regarding the houses of the wives of the Prophet ﷺ and that which were named after them of the houses (e.g., ‘Aishah’s house)
(4)
باب مَا جَاءَ فِي بُيُوتِ أَزْوَاجِ النَّبِيِّ صلى الله عليه وسلم، وَمَا نُسِبَ مِنَ الْبُيُوتِ إِلَيْهِنَّ
Sahih al-Bukhari 3099

Narrated `Aisha:

(the wife of the Prophet) When the sickness of Allah's Messenger (ﷺ) got aggravated, he asked the permission of his wives that he should be treated in my house, and they permitted him.

حَدَّثَنَا حِبَّانُ بْنُ مُوسَى، وَمُحَمَّدٌ، قَالاَ أَخْبَرَنَا عَبْدُ اللَّهِ، أَخْبَرَنَا مَعْمَرٌ، وَيُونُسُ، عَنِ الزُّهْرِيِّ، قَالَ أَخْبَرَنِي عُبَيْدُ اللَّهِ بْنُ عَبْدِ اللَّهِ بْنِ عُتْبَةَ بْنِ مَسْعُودٍ، أَنَّ عَائِشَةَ ـ رضى الله عنها ـ زَوْجَ النَّبِيِّ صلى الله عليه وسلم قَالَتْ لَمَّا ثَقُلَ رَسُولُ اللَّهِ صلى الله عليه وسلم اسْتَأْذَنَ أَزْوَاجَهُ أَنْ يُمَرَّضَ فِي بَيْتِي فَأَذِنَّ لَهُ‏.‏
Reference : Sahih al-Bukhari 3099
In-book reference : Book 57, Hadith 8
USC-MSA web (English) reference : Vol. 4, Book 53, Hadith 331
  (deprecated numbering scheme)