لَوْ خَرَجُواْ فِيكُم مَّا زَادُوكُمْ إِلاَّ خَبَالاً ولأَوْضَعُواْ خِلاَلَكُمْ يَبْغُونَكُمُ الْفِتْنَةَ وَفِيكُمْ سَمَّاعُونَ لَهُمْ وَاللّهُ عَلِيمٌ بِالظَّالِمِينَ
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سورة التوبة
(9/47) Had they gone forth with you, they would have added nothing except disorder. They would have been active among you, seeking you Fitnah, and among you. There are those who would listen to them, and Allah knows the wrong-doers.
Surah At-Tawbah