It wasnarrated that 'Ali bin Abu Talib said that when he washed theMessenger of Allah (ﷺ) he looked for what which is usually lookedfor on the deceased (i.e., dirt), and he found none. He said:
"Maymyfather be sacrificed for you, you are pure; you were pure in lifeandyou are pure in death."
English reference: Vol. 1, Book 6, Hadith 1467
Arabic reference: Book 6, Hadith 1534