Musnad Ahmad Hadith 1029

I was a man who emitted a great deal of madhi, so I asked the Prophet (ﷺ) and he said: “If you see madhi then do wudoo’ and wash your private part, and if you see water gushing then do ghusl.` I [the narrator] mentioned that to Sufyan and he said: I heard that from Rukain. Mu`awiyah and ibn Abi Bukair told us: Za`idah told us: ar-Rukain bin ar-Rabee bin ‘Ameelah al-Fazari told us... And he mentioned a similar report, and they said: water gushing. And Ibn Abu Bukair told us: Za`idah told us, and he also said, gushing.