Hadith 8:44
Abu Huraira reported the Prophet as saying, “Two people must separate only by mutual consent.” Abu Dawud transmitted it.
وَعَنْ أَبِي هُرَيْرَةَ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «لَا يَتَفَرَّقَنَّ اثْنَانِ إِلَّا عنْ تراضٍ» . رَوَاهُ أَبُو دَاوُد
Original Reference: Mishkat al-Masabih 2805