Allah, exalted be His praise, says: "And if you fear discord between husband and wife, then appoint one arbiter from the man's family and one arbiter from the woman's family; if they both desire reconciliation, Allah Almighty will bring about harmony between them (husband and wife)." [Surah al-Nisa: 35]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب القسم والنشوز / Q14782