Al-Kāfi - Volume 6 > The Two Arbitrators in the case of Discord
Hadith #2

عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ حَمَّادٍ عَنِ الْحَلَبِيِّ عَنْ أَبِي عَبْدِ اللَّهِ ( عليه السلام ) قَالَ سَأَلْتُهُ عَنْ قَوْلِ اللَّهِ عَزَّ وَ جَلَّ فَابْعَثُوا حَكَماً مِنْ أَهْلِهِ وَ حَكَماً مِنْ أَهْلِها قَالَ لَيْسَ لِلْحَكَمَيْنِ أَنْ يُفَرِّقَا حَتَّى يَسْتَأْمِرَا الرَّجُلَ وَ الْمَرْأَةَ وَ يَشْتَرِطَا عَلَيْهِمَا إِنْ شِئْنَا جَمَعْنَا وَ إِنْ شِئْنَا فَرَّقْنَا فَإِنْ جَمَعَا فَجَائِزٌ فَإِنْ فَرَّقَا فَجَائِزٌ .

2. Ali ibn Ibrahim has narrated from his father from ibn abu ‘Umayr from Hammad from al-Halabiy who has said the following: “I once asked abu ‘Abd Allah, ‘Alayhi al-Salam, about the words of Allah, most Majestic, most Glorious, ‘If you are afraid of discord between them then send one arbitrators from his people and another from her people.’ (4:35) He (the Imam) said, ‘The arbitrator cannot separate or unite them without first getting approval from the man and woman and a stipulation that their decision of separating or uniting them must be treated binding. Thus, if they decided for separation or unification it is permissible.’”