وَمَا أَصَابَكُمْ يَوْمَ الْتَقَى الْجَمْعَانِ فَبِإِذْنِ اللّهِ وَلِيَعْلَمَ الْمُؤْمِنِينَ
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سورة آل عمران
(3/166) And what befell you (adversity) on the day when the two parties met, was by Allah’s Leave, in order that He might know (determine) the believers.
Surah Al Imran