18:104
ٱلَّذِينَضَلَّسَعْيُهُمْفِىٱلْحَيَوٰةِٱلدُّنْيَاوَهُمْيَحْسَبُونَأَنَّهُمْيُحْسِنُونَصُنْعًا١٠٤
alladhīna ḍalla saʿyuhum fī l-ḥayati l-dun'yā wahum yaḥsabūna annahum yuḥ'sinūna ṣun'ʿan
[They are] those whose effort is lost in worldly life, while they think that they are doing well in work."(104)