Hūd - 118

﴿وَلَوْ شَاءَ رَبُّكَ لَجَعَلَ النَّاسَ أُمَّةً وَاحِدَةً ۖ وَلَا يَزَالُونَ مُخْتَلِفِينَ﴾

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(118) And if your Lord had willed, He could have made mankind one community; but they will not cease to differ,