(8) باب مَا كَانَ النَّبِيُّ صلى الله عليه وسلم يُسْأَلُ مِمَّا لَمْ يُنْزَلْ عَلَيْهِ الْوَحْىُ فَيَقُولُ: «لاَ أَدْرِي»
Narrated Jabir bin `Abdullah:
I fell ill, Allah's Messenger (ﷺ) and Abu Bakr came to visit me on foot. The Prophet (ﷺ) came to me while I was unconscious. Allah's Messenger (ﷺ) performed ablution and poured the Remaining water of his ablution over me whereupon I became conscious and said, 'O Allah's Messenger (ﷺ)! How should I spend my wealth? Or how should I deal with my wealth?" But the Prophet (ﷺ) did not give me any reply till the Verse of the laws of inheritance was revealed.
Reference: Sahih al-Bukhari 7309
In-book reference: Book 96, Hadith 40
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 92, Hadith 412