بُلُوغُ الْمَرَامِ
Bulugh al-Maram 1075
Marriage
وَعَنْ أَبِي هُرَيْرَةَ - رضى الله عنه - قَالَ : قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ ثَلَاثٌ جِدُّهنَّ جِدٌّ , وَهَزْلُهُنَّ جِدٌّ : اَلنِّكَاحُ , وَالطَّلَاقُ , وَالرَّجْعَةُ } رَوَاهُ اَلْأَرْبَعَةُ إِلَّا النَّسَائِيَّ , وَصَحَّحَهُ اَلْحَاكِمُ [1] .
Narrated Abu Hurairah (RA): Allah's Messenger (ﷺ) 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." [Reported by al-Arba'a except an-Nasa'i. al-Hakim graded it Sahih (authentic)].
Sunnah.com reference: Book 8, Hadith 130