﴿ وَمَآ أَصَٰبَكُمْ يَوْمَ ٱلْتَقَى ٱلْجَمْعَانِ فَبِإِذْنِ ٱللَّهِ وَلِيَعْلَمَ ٱلْمُؤْمِنِينَ ﴾

“and all that befell you on the day when the two hosts met in battle happened by God's leave, so that He might mark out the [true] believers,”

(That which befell you) of deaths and injuries, (on the day when the two armies) the army of Muhammad and that of Abu Sufyan (met, was by permission of Allah) by His will and decree; (that He might know the true believers) that He might see the believers in jihad;