Jami` At-Tirmidhi - جامع الترمذي
11. The Book on Marriage - كتاب النكاح عن رسول الله صلى الله عليه وسلم
34) Chapter: What Has Been Related About A Man Who Accepts Islam While He Is Married To Two Sisters
Abu Wahb Al-Jaishani narrated that:
He heard Ibn Fairuz Ad-Dhailami narrating from his father: "I went to the Prophet and said: 'O Messenger of Allah! I accepted Islam and I had two sisters (as wives).' So the Messenger of Allah said: 'Chose whichever of them you will.'"
34) باب مَا جَاءَ فِي الرَّجُلِ يُسْلِمُ وَعِنْدَهُ أُخْتَانِ
حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا ابْنُ لَهِيعَةَ، عَنْ أَبِي وَهْبٍ الْجَيْشَانِيِّ، أَنَّهُ سَمِعَ ابْنَ فَيْرُوزَ الدَّيْلَمِيَّ، يُحَدِّثُ عَنْ أَبِيهِ، قَالَ أَتَيْتُ النَّبِيَّ صلى الله عليه وسلم فَقُلْتُ يَا رَسُولَ اللَّهِ إِنِّي أَسْلَمْتُ وَتَحْتِي أُخْتَانِ . فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم . " اخْتَرْ أَيَّتَهُمَا شِئْتَ "