Yahya related to mefrom Malikthat Abdullah ibn Dinar said, "I sawAbdullah ibn Umar urinating while standing."Yahya said thatMalik was asked if any hadith had come down about washing the privateparts of urine and faeces and he said, "I have heard that some ofthose who have passed away used to wash themselves of faeces. I liketo wash my private parts of urine."
USC-MSA web (English) reference: Book 2, Hadith 114
Arabic reference: Book 2, Hadith 143