concerning the Verse: 'Do not prevent them' (2.232) Ma'qil bin Yasar told me that it was revealed in his connection. He said, "I married my sister to a man and he divorced her, and when her days of 'Idda (three menstrual periods) were over, the man came again and asked for her hand, but I said to him, 'I married her to you and made her your bed (your wife) and favored you with her, but you divorced her. Now you come to ask for her hand again? No, by Allah, she will never go back to you (again)!' That man was not a bad man and his wife wanted to go back to him. So Allah revealed this Verse: 'Do not prevent them.' (2.232) So I said, 'Now I will do it (let her go back to him), O Messenger of Allah ﷺ."So he married her to him again. (Using translation from Bukhārī 5130)   

فِي قَوْلِهِ تَعَالَى ﷻ {فَلَا تَعْضُلُوهُنَّ أَنْ يَنْكِحْنَ أَزْوَاجَهُنَّ} [البقرة 232] الْآيَةَ حَدَّثَنِي مَعْقِلُ بْنُ يَسَارٍ الْمُزَنِيُّ ؓ أَنَّهَا نَزَلَتْ فِيهِ قَالَ كُنْتُ زَوَّجْتُ أُخْتًا لِي مِنْ رَجُلٍ فَطَلَّقَهَا حَتَّى إِذَا انْقَضَتْ عِدَّتُهَا جَاءَ يَخْطُبُهَا فَقُلْتُ لَهُ زَوَّجْتُكَ وَفَرَشْتُكَ وَأَكْرَمْتُكَ فَطَلَّقْتَهَا ثُمَّ جِئْتَ تَخْطُبُهَا لَا وَاللهِ لَا تَعُودُ إِلَيْهَا أَبَدًا قَالَ وَكَانَ رَجُلًا لَا بَأْسَ بِهِ وَكَانَتِ الْمَرْأَةُ تُرِيدُ أَنْ تَرْجِعَ إِلَيْهِ فَأَنْزَلَ اللهُ هَذِهِ الْآيَةَ فَقُلْتُ الْآنَ أَفْعَلُ يَا رَسُولَ اللهِ فَزَوَّجْتُهَا إِيَّاهُ  

[Machine] Leave her while he is capable, then approach her and propose to her. And there was a barrier between him and her, so Allah the Almighty revealed the verse: "And when you divorce women and they have nearly fulfilled their term, do not prevent them from remarrying their [former] husbands" [Quran 2:232]. The Messenger of Allah ﷺ called him and recited the verse to him, so he abandoned the jealousy and complied with the command of Allah.  

خَلِّ عَنْهَا وَهُوَ يَقْدِرُ ثُمَّ قَرُبَ يَخْطُبُهَا فَحَالَ بَيْنَهُ وَبَيْنَهَا فَأَنْزَلَ اللهُ تَعَالَى {وَإِذَا طَلَّقْتُمُ النِّسَاءَ فَبَلَغْنَ أَجَلَهُنَّ فَلَا تَعْضُلُوهُنَّ أَنْ يَنْكِحْنَ أَزْوَاجَهُنَّ} [البقرة 232] الْآيَةَ فَدَعَاهُ رَسُولُ اللهِ ﷺ فَقَرَأَهَا عَلَيْهِ فَتَرَكَ الْحَمِيَّةَ ثُمَّ اسْتَقَادَ لِأَمْرِ اللهِ ﷻ