وَالَّذينَ كَفَرُواْ بَعْضُهُمْ أَوْلِيَاء بَعْضٍ إِلاَّ تَفْعَلُوهُ تَكُن فِتْنَةٌ فِي الأَرْضِ وَفَسَادٌ كَبِيرٌ
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سورة الأنفال
(8/73) And those who disbelieve, they are the friends to each other. If you do not do it (if you do not become friends of one another) there will be in the land Fitnah and a great mischief.
Surah Al-Anfal