Al Anfal Ayah 73

وَٱلَّذِينَ كَفَرُواْ بَعْضُهُمْ أَوْلِيَآءُ بَعْضٍ‌ۚ إِلَّا تَفْعَلُوهُ تَكُن فِتْنَةٌ فِى ٱلْأَرْضِ وَفَسَادٌ كَبِيرٌ ٧٣ As for the disbelievers, they are guardians of one another. And unless you ?believers? act likewise, there will be great oppression and corruption in the land.