(4) باب مَا جَاءَ فِي بُيُوتِ أَزْوَاجِ النَّبِيِّ صلى الله عليه وسلم، وَمَا نُسِبَ مِنَ الْبُيُوتِ إِلَيْهِنَّ
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.
Reference: Sahih al-Bukhari 3099
In-book reference: Book 57, Hadith 8
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 53, Hadith 331