Holy Quran » ALI 'IMRAN : 166

3 : 166

وَمَا أَصَابَكُمْ يَوْمَ الْتَقَى الْجَمْعَانِ فَبِإِذْنِ اللّهِ وَلِيَعْلَمَ الْمُؤْمِنِينَ

And what struck you on the day the two armies met was by permission of Allah that He might make evident the [true] believers.

Tafseer

{ وما أصابكم يوم التقى الجمعان } بأحد { فبإذن الله } بإرادته { وليعلم } علم ظهور { المؤمنين } حقا .

And misfortune on one of the two armies met then God willing willingly It teaches the faithful aware of the emergence of really.