The Saheeh International Quran Translation
وَمَآ أَصَٰبَكُمْ يَوْمَ ٱلْتَقَى ٱلْجَمْعَانِ فَبِإِذْنِ ٱللَّهِ وَلِيَعْلَمَ ٱلْمُؤْمِنِينَ
تجهيز للطباعة
And what struck you on the day the two armies met was by permission of Allah that He might make evident the [true] believers.