حَدَّثَنَا الْقَعْنَبِيُّ، حَدَّثَنَا عَبْدُ الْعَزِيزِ، - يَعْنِي ابْنَ مُحَمَّدٍ - عَنْ عَبْدِ الرَّحْمَنِ بْنِ حَبِيبٍ، عَنْ عَطَاءِ بْنِ أَبِي رَبَاحٍ، عَنِ ابْنِ مَاهَكَ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ ثَلاَثٌ جِدُّهُنَّ جِدٌّ وَهَزْلُهُنَّ جِدٌّ النِّكَاحُ وَالطَّلاَقُ وَالرَّجْعَةُ ‏"‏ ‏.‏

Narrated AbuHurayrah: The Prophet (PBUH) said: There are three things which, whether undertaken seriously or in jest, are treated as serious: Marriage, divorce and taking back a wife (after a divorce which is not final) Translation Not Available

Book Ref: Sunan Abi Dawud Book 13 Hadith 2194
Web Ref:  Sunan Abi Dawud Book 12 Hadith 2189