I embraced Islam while I had eight wives. So I mentioned it to the Prophet ﷺ. The Prophet (said) said: Select four of them. Abu Dawud said: This tradition has also been narrated to us by Ahmad b. Ibrahim from Hushaim. He said: Qais b. al-Harith instead of al-Harith b. Qais. Ahmad b. Ibrahim said: This is correct, i.e. Qais b. al-Harith.  

أَسْلَمْتُ وَعِنْدِي ثَمَانُ نِسْوَةٍ فَذَكَرْتُ ذَلِكَ لِلنَّبِيِّ ﷺ فَقَالَ النَّبِيُّ ﷺ اخْتَرْ مِنْهُنَّ أَرْبَعًا  

The tradition mentioned above has also been transmitted by Qais bin Al Harith through a different chain of narrators to the same effect.  

عَنْ قَيْسِ بْنِ الْحَارِثِ بِمَعْنَاهُ  

I said: Messenger of Allah, I have embraced Islam and two sisters are my wives. He said: Divorce any one of them you wish.  

قُلْتُ يَا رَسُولَ اللَّهِ إِنِّي أَسْلَمْتُ وَتَحْتِي أُخْتَانِ قَالَ طَلِّقْ أَيَّتَهُمَا شِئْتَ