Sura al-Ḥashr 59:14

لَا يُقَٰتِلُونَكُمْ جَمِيعًا إِلَّا فِى قُرًى مُّحَصَّنَةٍ أَوْ مِن وَرَآءِ جُدُرٍۭ بَأْسُهُم بَيْنَهُمْ شَدِيدٌ تَحْسَبُهُمْ جَمِيعًا وَقُلُوبُهُمْ شَتَّىٰ ذَٰلِكَ بِأَنَّهُمْ قَوْمٌ لَّا يَعْقِلُونَ

lā yuqātilūnakum jamīʿan illā fī quran muḥaṣṣanatin aw min warāʾi judurin basuhum baynahum shadīdun taḥsabuhum jamīʿan waqulūbuhum shatta dhālika bi-annahum qawmun lā yaʿqilūna

They will not fight you (even) together, except in fortified townships, or from behind walls. Strong is their fighting (spirit) amongst themselves: thou wouldst think they were united, but their hearts are divided: that is because they are a people devoid of wisdom.