Surah Al-Kahf Verse 104 - English Translation by Ali Unal
Surah Al-Kahfٱلَّذِينَ ضَلَّ سَعۡيُهُمۡ فِي ٱلۡحَيَوٰةِ ٱلدُّنۡيَا وَهُمۡ يَحۡسَبُونَ أَنَّهُمۡ يُحۡسِنُونَ صُنۡعًا
Those whose endeavor has been wasted in this world (because it is directed only to this-worldly ends, and so it is bound to be wasted hereafter also) but who themselves reckon that they are doing good