وَحَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، أَنَّهُ قَالَ بَلَغَنِي أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ لِرَجُلٍ مِنْ ثَقِيفٍ أَسْلَمَ وَعِنْدَهُ عَشْرُ نِسْوَةٍ حِينَ أَسْلَمَ الثَّقَفِيُّ ‏"‏ أَمْسِكْ مِنْهُنَّ أَرْبَعًا وَفَارِقْ سَائِرَهُنَّ ‏"‏ ‏.‏

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.' " Translation Not Available

Book Ref: Muwatta Imam Malik Book 29 Hadith 1238
Web Ref:  Muwatta Imam Malik Book 29 Hadith 76