18:104
ٱلَّذِينَ ضَلَّ سَعْيُهُمْ فِى ٱلْحَيَوٰةِ ٱلدُّنْيَا وَهُمْ يَحْسَبُونَ أَنَّهُمْ يُحْسِنُونَ صُنْعًا١٠٤
[They are] those whose effort is lost in worldly life, while they think that they are doing well in work."
— Saheeh International
الْكَهْفُ