Military discipline and organization

إِنَّ ٱللَّهَ يُحِبُّ ٱلَّذِينَ يُقَـٰتِلُونَ فِى سَبِيلِهِۦ صَفًّا كَأَنَّهُم بُنْيَـٰنٌ مَّرْصُوصٌ

Indeed, Allāh loves those who fight in His cause in a row as though they are a [single] structure joined firmly.