Sahih Muslim 3021 a
'A'isha said in connection with the verse:
" And if a woman has reason to fear ill-treatment from her husband or that he might turn away from her" (iv. 128) that it was revealed in case of a woman who had long association with a person (as his wife) and now he intends to divorce her and she says: Do not divorce me, but retain me (as wife in your house) and you are permitted to live with another wife. It is in this context that this verse was revealed.
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَبْدَةُ بْنُ سُلَيْمَانَ، حَدَّثَنَا هِشَامٌ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، ‏{‏ وَإِنِ امْرَأَةٌ خَافَتْ مِنْ بَعْلِهَا نُشُوزًا أَوْ إِعْرَاضًا‏}‏ الآيَةَ قَالَتْ أُنْزِلَتْ فِي الْمَرْأَةِ تَكُونُ عِنْدَ الرَّجُلِ فَتَطُولُ صُحْبَتُهَا فَيُرِيدُ طَلاَقَهَا فَتَقُولُ لاَ تُطَلِّقْنِي وَأَمْسِكْنِي وَأَنْتَ فِي حِلٍّ مِنِّي ‏.‏ فَنَزَلَتْ هَذِهِ الآيَةُ ‏.‏