Quran 9:47

لَوۡ خَرَجُواْ فِيكُم مَّا زَادُوكُمۡ إِلَّا خَبَالاً۬ وَلَأَوۡضَعُواْ خِلَـٰلَكُمۡ يَبۡغُونَڪُمُ ٱلۡفِتۡنَةَ وَفِيكُمۡ سَمَّـٰعُونَ لَهُمۡ‌ۗ وَٱللَّهُ عَلِيمُۢ بِٱلظَّـٰلِمِينَ ٤٧

Had they mobilized with you, they would have created confusion, and would have caused disputes and divisions among you. Some of you were apt to listen to them. ALLAH is fully aware of the transgressors.