"Ali bin Abi Talib sent Al-Miqdad to the Messenger of Allah (ﷺ) to ask him about a man who notices Madhi. The Messenger of Allah (ﷺ) said: 'Let him wash his penis then perform Wudu'.'"
Sunan an-Nasa'i Book 4, Hadith 45
← Previous Hadith "I sent Al-Miqdad to the Messenger of Allah (ﷺ) to ask him about Madhi, and he said: 'Perform Wudu' and sprinkle water over your private part.'" Abu 'Abdur-Rahman said: Makhramah (one of the narrators) did not hear anything from his father.

Sunan an-Nasa'i Book 4, Hadith 44 Next Hadith → ) "For his daughter is (married) to me and I feel too shy to ask him." So he asked the Messenger of Allah (ﷺ) about that and he said: "If any one of you notices that let him sprinkle water on his private parts and perform Wudu' as for prayer."

Sunan an-Nasa'i Book 4, Hadith 46