Al-Kahf 18:104
الَّذِينَ ضَلَّ سَعْيُهُمْ فِي الْحَيَاةِ الدُّنْيَا وَهُمْ يَحْسَبُونَ أَنَّهُمْ يُحْسِنُونَ صُنْعًا ١٠٤
Allatheena dalla saAAyuhum fee alhayati alddunya wahum yahsaboona annahum yuhsinoona sunAAan
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“Those whose effort goeth astray in the life of the world, and yet they reckon that they do good work.” (18:104)