ٱلَّذِينَ ضَلَّ سَعْيُهُمْ فِى ٱلْحَيَوٰةِ ٱلدُّنْيَا وَهُمْ يَحْسَبُونَ أَنَّهُمْ يُحْسِنُونَ صُنْعًا

Al-Kahf — Ayah 104

The Cave · الكهف · 18:104

Those are the ones whose effort in the worldly life has gone in vain, while they think they are doing well.

Translation: Mufti Taqi Usmani