Sahih Bukhari
Companions of the Prophet
Volume: 005 / Book Number: 057 / Hadith Number: 109
Narrated Ibn Abi Mulaika:
Somebody said to Ibn 'Abbas, "Can you speak to the chief of the believers Muwaiya, 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) ."