(28) باب ذِكْرُ مُعَاوِيَةَ رضى الله عنه
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)."
Reference: Sahih al-Bukhari 3764
In-book reference: Book 62, Hadith 111
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 5, Book 57, Hadith 108