Al-Hashr - 59:14

لَا يُقَاتِلُونَكُمْ جَمِيعًا إِلَّا فِي قُرًى مُّحَصَّنَةٍ أَوْ مِن وَرَاء جُدُرٍ بَأْسُهُمْ بَيْنَهُمْ شَدِيدٌ تَحْسَبُهُمْ جَمِيعًا وَقُلُوبُهُمْ شَتَّى ذَلِكَ بِأَنَّهُمْ قَوْمٌ لَّا يَعْقِلُونَ
[59:14]
They will not fight against you in a body save in fortified towns or from behind walls; their fighting between them is severe, you may think them as one body, and their hearts are disunited; that is because they are a people who have no sense.
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.
They will not fight against you in a body save in fortified villages or from behind walls. Their adversity among themselves is very great. Ye think of them as a whole whereas their hearts are divers. That is because they are a folk who have no sense.