17:10
وَأَنَّ ٱلَّذِينَ لَا يُؤْمِنُونَ بِٱلْـَٔاخِرَةِ أَعْتَدْنَا لَهُمْ عَذَابًا أَلِيمًۭا ١٠
Saheeh International
And that those who do not believe in the Hereafter - We have prepared for them a painful punishment.
Tafsir of "Ibn Kathir" (English)
وأَنَّ الَّذِينَ لاأَ يُوْمِنُونَ بِالاأخِرَةِthose who do not believe in the Hereafter,أَعْتَدْنَاWe have preparedلَهُمْ عَذَابًا أَلِيمًاfor them is a painful torment,i.e. on the Day of Resurrection.As Allah says:فَبَشِّرْهُمْ بِعَذَابٍ أَلِيمٍ then announce to them a painful torment. (84:24)