Rubbing hands and feet with dust (Tayammum)

Bukhari :: Book 1 :: Volume 7 :: Hadith 333

Narrated Abu Juhaim Al-Ansari:

The Prophet came from the direction of Bir Jamal. A man met him and greeted him. But he did not return back the greeting till he went to a (mud) wall and smeared his hands and his face with its dust (performed Tayammum) and then returned back the greeting.