An-Nahl 16:92
وَلَا تَكُونُوا كَالَّتِي نَقَضَتْ غَزْلَهَا مِن بَعْدِ قُوَّةٍ أَنكَاثًا تَتَّخِذُونَ أَيْمَانَكُمْ دَخَلًا بَيْنَكُمْ أَن تَكُونَ أُمَّةٌ هِيَ أَرْبَىٰ مِنْ أُمَّةٍ ۚ إِنَّمَا يَبْلُوكُمُ اللَّهُ بِهِ ۚ وَلَيُبَيِّنَنَّ لَكُمْ يَوْمَ الْقِيَامَةِ مَا كُنتُمْ فِيهِ تَخْتَلِفُونَ ٩٢
Wala takoonoo kaallatee naqadat ghazlaha min baAAdi quwwatin ankathan tattakhithoona aymanakum dakhalan baynakum an takoona ommatun hiya arba min ommatin innama yablookumu Allahu bihi walayubayyinanna lakum yawma alqiyamati ma kuntum feehi takhtalifoona
And be not as a woman who breaks her thread, after it is firmly spun, into fibres, by taking your oaths as mere mutual deceit, one nation being more numerous than another nation. God only tries you thereby; and certainly He will make clear to you upon the Day of Resurrection that whereon you were at variance. (16:92)