وَمَا كَانَ النَّاسُ إِلاَّ أُمَّةً وَاحِدَةً فَاخْتَلَفُواْ وَلَوْلاَ كَلِمَةٌ سَبَقَتْ مِن رَّبِّكَ لَقُضِيَ بَيْنَهُمْ فِيمَا فِيهِ يَخْتَلِفُونَ
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سورة يونس
(10/19) And mankind was not but one community. Then later they differed. Had not a Word already gone forth from your Lord, the matter would have certainly been decided between them regarding what they differed.
Surah Yunus