الَّذِينَ ضَلَّ سَعْيُهُمْ فِي الْحَيَاةِ الدُّنْيَا وَهُمْ يَحْسَبُونَ أَنَّهُمْ يُحْسِنُونَ صُنْعًا
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سورة الكهف
(18/104) They are those whose effort is wasted in the life of the world, and they deem that they are doing well in performance.
Surah Al-Kahf