سُورَةُ الكَهۡفِ
Al-Kahf·18:104
الَّذِينَ ضَلَّ سَعْيُهُمْ فِي الْحَيَاةِ الدُّنْيَا وَهُمْ يَحْسَبُونَ أَنَّهُمْ يُحْسِنُونَ صُنْعًا١٠٤
"[It is] they whose labour has gone astray in [the pursuit of no more than] this world's life, and who none the less think that they are doing good works: