Sahih al-Bukhari 194
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.‏