Sahih Bukhari Volume 007, Book 070, Hadith Number 580.
Narrated By Jabir bin Abdullah : The Prophet came to me while I was ill. He performed ablution and threw the remaining water on me (or said, "Pour it on him) " When I came to my senses I said, "O Allah's Apostle! I have no son or father to be my heir, so how will be my inheritance?" Then the Verse of inheritance was revealed.