Al-Kahf 104

ٱلَّذِينَ ضَلَّ سَعْيُهُمْ فِى ٱلْحَيَوٰةِ ٱلدُّنْيَا وَهُمْ يَحْسَبُونَ أَنَّهُمْ يُحْسِنُونَ صُنْعًا ﴿١٠٤﴾

Allatheena dalla saAAyuhum fee alhayati alddunya wahum yahsaboona annahum yuhsinoona sunAAan

"Those whose efforts have been wasted in this life while they thought that they were acquiring good by their deeds! The Noble Quran