Qur'an 61:4

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.”

As-Saff 61:4 · Saheeh International