لِّيَسْأَلَ الصَّادِقِينَ عَن صِدْقِهِمْ وَأَعَدَّ لِلْكَافِرِينَ عَذَابًا أَلِيمًا

so that He may question the truthful concerning their truthfulness. And He has prepared for the faithless a painful punishment.