Sahih Bukhari Volume 6, Book 65, Hadith 4918

حَدَّثَنَا عَمْرُو بْنُ عَوْنٍ، حَدَّثَنَا هُشَيْمٌ، عَنْ حُمَيْدٍ، عَنْ أَنَسٍ، قَالَ قَالَ عُمَرُ ـ رضى الله عنه ـ اجْتَمَعَ نِسَاءُ النَّبِيِّ صلى الله عليه وسلم فِي الْغَيْرَةِ عَلَيْهِ فَقُلْتُ لَهُنَّ عَسَى رَبُّهُ إِنْ طَلَّقَكُنَّ أَنْ يُبَدِّلَهُ أَزْوَاجًا خَيْرًا مِنْكُنَّ‏.‏ فَنَزَلَتْ هَذِهِ الآيَةُ‏.‏

Narrated By 'Umar : The wives of the Prophet out of their jealousy, backed each other against the Prophet, so I said to them, "It may be, if he divorced you all, that Allah will give him, instead of you wives better than you." So this Verse was revealed. (66.5)