Sahih Muslim 3021
Sahih Muslim · Book 56: The Book of Commentary on the Qur'an
'A'isha said in connection with these words of Allah, the Exalted and Glorious:
حَدَّثَنَا أَبُو كُرَيْبٍ ، حَدَّثَنَا أَبُو أُسَامَةَ ، حَدَّثَنَا هِشَامٌ ، عَنْ أَبِيهِ ، عَنْ عَائِشَةَ ، فِي قَوْلِهِ عَزَّ وَجَلَّ { وَإِنِ امْرَأَةٌ خَافَتْ مِنْ بَعْلِهَا نُشُوزًا أَوْ إِعْرَاضًا} قَالَتْ نَزَلَتْ فِي الْمَرْأَةِ تَكُونُ عِنْدَ الرَّجُلِ فَلَعَلَّهُ أَنْ لاَ يَسْتَكْثِرَ مِنْهَا وَتَكُونُ لَهَا صُحْبَةٌ وَوَلَدٌ فَتَكْرَهُ أَنْ يُفَارِقَهَا فَتَقُولُ لَهُ أَنْتَ فِي حِلٍّ مِنْ شَأْنِي .
" And if a woman has reason to fear ill-treatment from her husband or that he might turn away from her" that it was revealed in case of a woman who lived with a person and perhaps he does not want to prolong (his relationship with her) whereas she has had sexual relationship with him (and as a result thereof) she got a child from him and she does not like that she should be divorced, so she says to him: I permit you to live with the other wife.