Abu Dawud Book 1, Hadith Number 381.
Chapter : The earth smeared with urine.
Narated By Abdullah ibn Ma’qil ibn Muqarrin : A bedouin prayed with the Prophet (PBUH). He then narrated the tradition (No 0380) about urinating of that bedouin. This version adds: The Prophet (PBUH) said: Remove the earth where he urinated and throw it away and pour water upon the place.