The necessity of Akhirah (Hereafter) in Islamic creed

وَأَنَّ ٱلَّذِينَ لَا يُؤْمِنُونَ بِٱلْـَٔاخِرَةِ أَعْتَدْنَا لَهُمْ عَذَابًا أَلِيمًا

And that those who do not believe in the Hereafter - We have prepared for them a painful punishment.