8:73
Al-Anfal 73
Surah Al-Anfal (الأنفال), verse 73 — reference 8:73. Arabic text with optional translation and free audio on Al-Qalam.
وَٱلَّذِينَ كَفَرُوا۟ بَعْضُهُمْ أَوْلِيَآءُ بَعْضٍ ۚ إِلَّا تَفْعَلُوهُ تَكُن فِتْنَةٌ فِى ٱلْأَرْضِ وَفَسَادٌ كَبِيرٌ
wa-alladhīna kafarū baʿḍuhum awliyāu baʿḍin illā tafʿalūhu takun fit'natun fī l-arḍi wafasādun kabīrun
And those who disbelieved are allies of one another. If you do not do so [i.e., ally yourselves with other believers], there will be fitnah [i.e., disbelief and oppression] on earth and great corruption.