Sunan an-Nasa'i, 134

It was narrated from Al-Hakam, from his father, that when the Messenger of Allah (ﷺ) performed Wudu', he would take a handful of water and do this with it. Shu'bah described it:"He would sprinkle his private parts with it." [1] Shaikh Ibn As-Sunni said: "Al-Hakam (one of the narrators) is Ibn Sufyan Ath-Thaqafi. [1] The purpose is to ward off devilish whispers lest the person think any emission has taken place, and thus think that his Wudu' has been invalidated

Rapporté par Al-Hakam, d'après son père : Quand le Messager d'Allah (ﷺ) faisait ses ablutions, il prenait une poignée d'eau et faisait ceci avec. Shu'bah a expliqué : "Il en aspergeait ses parties intimes." (Le but est d'éviter les doutes et les mauvaises pensées concernant la validité de l'ablution)