حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عَلِيَّ بْنَ أَبِي طَالِبٍ، قَالَ فِي الْحَكَمَيْنِ اللَّذَيْنِ قَالَ اللَّهُ تَعَالَى ‏{‏وَإِنْ خِفْتُمْ شِقَاقَ بَيْنِهِمَا فَابْعَثُوا حَكَمًا مِنْ أَهْلِهِ وَحَكَمًا مِنْ أَهْلِهَا إِنْ يُرِيدَا إِصْلاَحًا يُوَفِّقِ اللَّهُ بَيْنَهُمَا إِنَّ اللَّهَ كَانَ عَلِيمًا خَبِيرًا‏}‏ إِنَّ إِلَيْهِمَا الْفُرْقَةَ بَيْنَهُمَا وَالاِجْتِمَاعَ ‏.‏ قَالَ مَالِكٌ وَذَلِكَ أَحْسَنُ مَا سَمِعْتُ مِنْ أَهْلِ الْعِلْمِ أَنَّ الْحَكَمَيْنِ يَجُوزُ قَوْلُهُمَا بَيْنَ الرَّجُلِ وَامْرَأَتِهِ فِي الْفُرْقَةِ وَالاِجْتِمَاعِ ‏.‏

Yahya related to me from Malik that he had heard that Ali ibn AbiTalib said about the two arbiters about whom Allah, the Exalted,said,"If you fear a breach between the two, appoint an arbiter fromhis people, and an arbiter from her people. If they desire to setthings aright, Allah will make peace between them, surely Allah isKnowing, Aware," (Sura 4 ayat 35), that the separation and the joiningwere overseen by the two of them. Malik said, "That is thebest of what I have heard from the people of knowledge. Whatever thetwo arbiters say concerning separation or joining is taken intoconsideration " Translation Not Available

Book Ref: Muwatta Imam Malik Book 29 Hadith 1233
Web Ref:  Muwatta Imam Malik Book 29 Hadith 72