Āl-‘Imrān - 141

﴿وَلِيُمَحِّصَ اللَّهُ الَّذِينَ آمَنُوا وَيَمْحَقَ الْكَافِرِينَ﴾

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141. And that Allâh may test (or purify) the believers (from sins) and destroy the disbelievers.