وَلِيُمَحِّصَ ٱللَّهُ ٱلَّذِينَ ءَامَنُوا۟ وَيَمْحَقَ ٱلْكَٰفِرِينَ
Commentary:
The reverse suffered at Uhud cleansed Muslims of their sins. It served as a sort of atonement for their sins. Moreover, the Battle of Uhud made some disbelievers realize that Islam was God’s religion. The very Meccans who took a leading part against the Muslims in that battle ultimately converted to Islam. Their hearts were conquered and disbelief was thereby destroyed.
The reverse suffered by Muslims at Uhud served as a sort of atonement for their lapse. Besides, the battle made some disbelievers realize that Islam was God’s own religion. The very Meccans who took a leading part against the Muslims in that battle converted to Islam not long after the battle. Islam had conquered their hearts, "destroying" their erstwhile disbelief.