Al-Hashr 59:14

La yuqatiloonakum jameeAAanilla fee quran muhassanatin aw min wara-ijudurin ba/suhum baynahum shadeedun tahsabuhum jameeAAanwaquloobuhum shatta thalika bi-annahum qawmun layaAAqiloon

They will not fight you all except within fortified cities or from behind walls. Their violence [i.e., enmity] among themselves is severe. You think they are together, but their hearts are diverse. That is because they are a people who do not reason.

They do not fight you, even assembled together, but in fortified towns, or from behind the walls. Their quarrelling between themselves is severe. You think that they are united, while their hearts are divided. That is because they are a people who have no sense.