Sayyiduna Qatadah (may Allah have mercy on him) narrates from Sayyiduna al-Hasan (may Allah have mercy on him) concerning: "Then appoint an arbiter from his family and an arbiter from her family" [Surah al-Nisa: 35], that the arbiters may bring the couple together, but they have no authority over separation.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب القسم والنشوز / 14793