Abu Dawud Book 1, Hadith Number 21.
Chapter : Safeguarding oneself from urine.
Narated By N/A : Ibn ‘Abbas also reported a tradition from the Prophet (PBUH) conveying the simmilar meaning.
The version of Jarir has the wording: “he did not cover himself while urinating.”
The version of Abu Mu’awiyah has the wording: “he did not safeguard himself (from urine).”