اَلَّذِيۡنَ ضَلَّ سَعۡيُهُمۡ فِي الۡحَيٰوةِ الدُّنۡيَا وَهُمۡ يَحۡسَبُوۡنَ اَنَّهُمۡ يُحۡسِنُوۡنَ صُنۡعًا

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