Sahih al-bukhari:3764 Chapter: The virtues of the Companions of the Prophet ﷺ Book 62, Hadith 109

Narrated Ibn Abu Mulaika: Muawiya offered one rak`a witr prayer after the `Isha prayer, and at that time a freed slave of Ibn
`Abbas was present. He (i.e. the slave) went to Ibn `Abbas (and told him that Muawiya offered one
rak`a witr prayer). Ibn `Abbas said, “Leave him, for he was in the company of Allah’s Messenger (ﷺ).”