English - Sahih International

Surah Al-Kahf ( The Cave ) - Aya count 110

ٱلَّذِينَ ضَلَّ سَعْيُهُمْ فِى ٱلْحَيَوٰةِ ٱلدُّنْيَا وَهُمْ يَحْسَبُونَ أَنَّهُمْ يُحْسِنُونَ صُنْعًا ﴿١٠٤﴾

[They are] those whose effort is lost in worldly life, while they think that they are doing well in work."