"The Messenger of Allah said: 'Allah smiles at three things: a row in the prayer, a man who prays in the depths of the night, and a man who fights' I think he said, 'behind the battalion.'" (Using translation from Ibn Mājah 200)
"إِنَّ الله لَيَضْحَكُ إِلَى ثَلاثة: الصَّف فِي الصَّلَاةِ؛ والرَّجُل يُصَلِّي في جَوْفِ الليلِ، ولِلرَّجُلِ يُقَاتِلُ خَلْفَ الْكَتِيبة".