Language:
كتاب الوضوء
4
Ablutions (Wudu')
(44)
Chapter: The sprinkling of remaining water after performing ablution on an unconscious person by the prophet (saw)
(44)
باب صَبِّ النَّبِيِّ صلى الله عليه وسلم وَضُوءَهُ عَلَى الْمُغْمَى عَلَيْهِ

Narrated Jabir:

Allah's Messenger (ﷺ) came to visit me while I was sick and unconscious. He performed ablution and sprinkled the remaining water on me and I became conscious and said, "O Allah's Messenger (ﷺ)! To whom will my inheritance go as I have neither ascendants nor descendants?" Then the Divine verses regarding Fara'id (inheritance) were revealed.

حَدَّثَنَا أَبُو الْوَلِيدِ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ مُحَمَّدِ بْنِ الْمُنْكَدِرِ، قَالَ سَمِعْتُ جَابِرًا، يَقُولُ جَاءَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَعُودُنِي، وَأَنَا مَرِيضٌ لاَ أَعْقِلُ، فَتَوَضَّأَ وَصَبَّ عَلَىَّ مِنْ وَضُوئِهِ، فَعَقَلْتُ فَقُلْتُ يَا رَسُولَ اللَّهِ لِمَنِ الْمِيرَاثُ إِنَّمَا يَرِثُنِي كَلاَلَةٌ‏.‏ فَنَزَلَتْ آيَةُ الْفَرَائِضِ‏.‏
Reference : Sahih al-Bukhari 194
In-book reference : Book 4, Hadith 60
USC-MSA web (English) reference : Vol. 1, Book 4, Hadith 193
  (deprecated numbering scheme)