مُوَطَّأُ مَالِكٍ
Muwatta Malik 1238
Divorce
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 have heard that the Messenger of Allah, (ﷺ), said to a man from Thaqif who had ten wives when he became muslim, 'Take four and separate from the rest.' "
Arabic/English book reference: Book 29, Hadith 76