Al-Dahhak bin Fayruz al-Daylami narrates from his father, Sayyiduna Fayruz al-Daylami (may Allah be pleased with him), that he came to the Messenger of Allah (peace and blessings be upon him) and said: O Messenger of Allah, I have accepted Islam and I have two sisters as my wives. The Messenger of Allah (peace and blessings be upon him) said: "Divorce whichever of them you wish."
Hadith Referenceالمعجم الكبير للطبراني / باب الفاء / 15934