Abu Dawud
Purification (Kitab Al-Taharah)
Book Number: 001 / Hadith Number: 166
Narated By Hakam ibn Sufyan ath-Thaqafi : When the Messenger of Allah (pbuh) urinated, he performed ablution and sprinkled water on private parts of the body.
Abu Dawud said: A group of scholars agreed with Sufyan upon this chain of narrators. Some have mentioned the name of Sufyan b. al-Hakam, and others al-Hakam b. Sufyan.