Bukhari :: Book 1 :: Volume 4 :: Hadith 245
Narrated Abu Burda:
My father said, "I came to the Prophet and saw him carrying a Siwak in his hand and cleansing his teeth, saying, 'U' U'," as if he was retching while the Siwak was in his mouth."
Source materials are from the University of Southern California MSA site|
Hadith eBooks converted from Imaan Star