"I was a man who emotted a great deal of Madhi. I told a man to ask the Prophet (ﷺ) (about that) and he said: 'Wudu' (is required) for that."
Sunan an-Nasa'i Book 4, Hadith 42
← Previous Hadith "Ali, Al-Miqdad and 'Ammar were talking. 'Ali said: 'I am a man who emits a lot of Madhi but I am too shy to ask the Messenger of Allah (ﷺ) about that because of his daughter's position with me, so let one of you ask him.' He told me that one of them - but I forgot who - asked him, and the Prophet (ﷺ) said: 'That is Madhi. If any one of you notices that, let him wash it off himself and perform Wudu' as for prayer or similar to the Wudu' of prayer.'"

Sunan an-Nasa'i Book 4, Hadith 41 Next Hadith → "I felt too shy to ask the Messenger of Allah (ﷺ) about Madhi because of Fatimah, so I told Al-Miqdad to ask him, and he said: 'Wudu' (is required) for that.'"

Sunan an-Nasa'i Book 4, Hadith 43