Surat Al-'Aĥzāb - سورة الأحزاب

لِّيَسْأَلَ الصَّادِقِينَ عَن صِدْقِهِمْ ۚ وَأَعَدَّ لِلْكَافِرِينَ عَذَابًا أَلِيمًا

Muhsin Khan: That He may ask the truthfuls (Allah's Messengers and His Prophets) about their truth (i.e. the conveyance of Allah's Message that which they were charged with). And He has prepared for the disbelievers a painful torment (Hell-fire).