Yahya related to me from Malik that Ibn Shihab said, "I haveheard that the Messenger of Allah, may Allah bless him and grant himpeace, said to a man from Thaqif who had ten wives when he becamemuslim, 'Take four and separate from the rest.' " (ES)
USC-MSA web (English) reference: Book 29, Hadith 76 (ES)
Arabic reference (ES): Book 29, Hadith 1238 (ES)