Sunan Ibn Majah Book 1, Hadith 196

"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.

Previous Hadith

He saw the Messenger of Allah perform ablution then take a handful of water and sprinkle it over his private area to remove any doubts about urine drippings.

Sunan Ibn Majah Book 1, Hadith 195
Next Hadith

"The Messenger of Allah said: 'When you perform ablution, sprinkle water.'"

Sunan Ibn Majah Book 1, Hadith 197