﴿ إِنَّ ٱللَّهَ يُحِبُّ ٱلَّذِينَ يُقَٰتِلُونَ فِى سَبِيلِهِۦ صَفًّۭا كَأَنَّهُم بُنْيَٰنٌۭ مَّرْصُوصٌۭ ﴾

“Verily, God loves [only] those who fight in His cause in [solid] ranks, as though they were a building firm and compact.”

Then He encouraged them to strive in His way, saying: (Lo! Allah loveth those who battle for His cause) in His obedience (in ranks, as if they were a solid structure) like a cemented block.