Sunan Ibn Majah Book 1, Hadith 197
"The Messenger of Allah said: 'When you perform ablution, sprinkle water.'"
"The Messenger of Allah said: 'Jibril taught me (how to perform) the ablution, and he ordered me to sprinkle water underneath my garment, lest a drop of urine leak out after the ablution.'" (Da'if)
Other chains with similar wording.
"The Messenger of Allah performed ablution and sprinkled his private part."