Al-Imām al-Bukhārī narrates: Musaddad narrated to us; he said: ‘Abdullāh ibn Dāwūd narrated to us, from al-A’mash, from al-Mundhir al-Thawrī, from Muḥammad ibn al-Ḥanafiyyah,
from ‘Alī (may Allāh Almighty be content with him), who said: “I was a man who experienced excessive discharge of madhī (pre-seminal fluid), so I instructed al-Miqdād (may Allāh Almighty be content with him) to ask the Prophet ﷺ. He asked him, and the Prophet ﷺ said: ‘For it, Wudū’ (ablution) is required.’”
Reference: Sahih Al Bukhari 132