Quran 59:14 from Surah Al-Hashr on Divine Marvels.
لَا يُقَٰتِلُونَكُمۡ جَمِيعًا إِلَّا فِي قُرٗى مُّحَصَّنَةٍ أَوۡ مِن وَرَآءِ جُدُرِۭۚ بَأۡسُهُم بَيۡنَهُمۡ شَدِيدٞۚ تَحۡسَبُهُمۡ جَمِيعٗا وَقُلُوبُهُمۡ شَتَّىٰۚ ذَٰلِكَ بِأَنَّهُمۡ قَوۡمٞ لَّا يَعۡقِلُونَ
English translation: Not will they fight you all except in towns fortified or from behind walls Their violence among themselves (is) severe You think they (are) united but their hearts (are) divided That (is) because they (are) a people not they reason
Transliteration: la yuqatilunakum jami'an illa fi quran muhassanatin aw min warai judurin basuhum baynahum shadidun tahsabuhum jami'an waqulubuhum shatta dhalika bi-annahum qawmun la ya'qiluna