It is narrated from Sayyiduna al-Hakam bin Sufyan al-Thaqafi (may Allah be pleased with him) that "The Prophet (peace and blessings be upon him) performed ablution, then took a handful of water and sprinkled it over his private part."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3167