Sunan an-Nasa'i — The Book of Purification — Hadith No: 154
Translation
It was narrated from 'A'ish bin Anas that 'Ali said:"I was a man who had a lot of prostatic discharge, so I told 'Ammar bin Yasir to ask the Messenger of Allah (ﷺ) (about it) because his daughter was married to me. He said: 'Wudu' is sufficient for that