Āl-‘Imrān - 141

﴿وَلِيُمَحِّصَ اللَّهُ الَّذِينَ آمَنُوا وَيَمْحَقَ الْكَافِرِينَ﴾

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(141) And that Allāh may purify the believers [through trials] and destroy the disbelievers.