The Prophet 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)  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ ثَلاَثٌ جِدُّهُنَّ جِدٌّ وَهَزْلُهُنَّ جِدٌّ النِّكَاحُ وَالطَّلاَقُ وَالرَّجْعَةُ  

The Messenger of Allah said: "Three are serious when they are serious, and serious when they are in jest: Marriage, divorce, and return."  

قَالَ رَسُولُ اللَّهِ ﷺ ثَلاَثٌ جِدُّهُنَّ جِدٌّ وَهَزْلُهُنَّ جِدٌّ النِّكَاحُ وَالطَّلاَقُ وَالرَّجْعَةُ  

the Messenger of Allah ﷺ said: "There are three matters in which seriousness is serious and joking is serious: marriage, divorce and taking back (one's wife). "  

قَالَ رَسُولُ اللَّهِ ﷺ ثَلاَثٌ جِدُّهُنَّ جِدٌّ وَهَزْلُهُنَّ جِدٌّ النِّكَاحُ وَالطَّلاَقُ وَالرَّجْعَةُ  

The Prophet 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) (Using translation from Abū Dāʾūd 2194)  

عَنْ رَسُولِ اللَّهِ ﷺ سَمِعَهُ يَقُولُ «ثَلَاثٌ جِدُّهُنَّ جِدٌّ وَهَزْلُهُنَّ جِدٌّ النِّكَاحُ وَالطَّلَاقُ وَالرَّجْعَةُ»  

"ثلاثٌ جِدُّهُنَّ جِدٌّ، وَهَزلُهُنَّ جِدٌّ: النِّكاحُ، وَالطَّلاقُ، والرَّجْعَةُ".