Aal-i-Imraan 3:141

وَلِيُمَحِّصَ ٱللَّهُ ٱلَّذِينَ ءَامَنُوا۟ وَيَمْحَقَ ٱلْكَٰفِرِينَ ١٤١

And that Allah may purify the believers [through trials] and destroy the disbelievers.