Sahih al-Bukhari #3765 · Companions of the Prophet

Sahih al-BukhariIbn Abi Mulaika
Sahih al-Bukhari · Book 62 · Companions of the Prophet
Sahih al-Bukhari · كتاب 62 · كتاب فضائل أصحاب النبي ﷺ
Somebody said to Ibn 'Abbas, "Can you speak to the chief of the believers Mu'awiyah, as he does not pray except one rak'a as witr?" Ibn 'Abbas replied, "He is a Faqih (i.e. a learned man who can give religious verdicts)
حَدَّثَنَا ابْنُ أَبِي مَرْيَمَ، حَدَّثَنَا نَافِعُ بْنُ عُمَرَ، حَدَّثَنِي ابْنُ أَبِي مُلَيْكَةَ، قِيلَ لاِبْنِ عَبَّاسٍ هَلْ لَكَ فِي أَمِيرِ الْمُؤْمِنِينَ مُعَاوِيَةَ، فَإِنَّهُ مَا أَوْتَرَ إِلاَّ بِوَاحِدَةٍ‏.‏ قَالَ إِنَّهُ فَقِيهٌ‏.‏
Reference : Sahih al-Bukhari 3765In-book reference : Book 62, Hadith 110