مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 3176
Marriage
Women with whom Marriage is Prohibited - Section 2
وَعَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُ أَنَّ غيلَان بن سَلمَة الثَّقَفِيَّ أَسْلَمَ وَلَهُ عَشْرُ نِسْوَةٍ فِي الْجَاهِلِيَّةِ فَأَسْلَمْنَ مَعَهُ فَقَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «أَمْسِكْ أَرْبَعًا وَفَارِقْ سَائِرَهُنَّ» . رَوَاهُ أَحْمَدُ وَالتِّرْمِذِيّ وَابْن مَاجَه
Ibn ‘Umar told that Ghailan b. Salama ath-Thaqafi accepted Islam and that he had had ten wives in the pre-Islamic period who accepted Islam along with him; so the Prophet (ﷺ) told him to keep four and separate from the rest of them. Ahmad, Tirmidhi and Ibn Majah transmitted it.
Mishkat al-Masabih, 3176صَحِيح (الألباني)