Sahih Bukhari Volume 004, Book 056, Hadith Number 685.

Narated By Ribi bin Hirash : 'Uqba said to Hudhaifa, "Won't you narrate to us what you heard from Allah's Apostle ?" Hudhaifa said, "I heard him saying, 'Death approached a man and when he had no hope of surviving, he said to his family, 'When I die, gather for me much wood and build a fire (to burn me),. When the fire has eaten my flesh and reached my bones, take the bones and grind them and scatter the resulting powder in the sea on a hot (or windy) day.' (That was done.) But Allah collected his particles and asked (him), 'Why did you do so?' He replied, 'For fear of You.' So Allah forgave him."

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