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

“"[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:”

Please check ayah 18:106 for complete tafsir.