Al-Kahf 18:104 · سُورَةُ الكهف

ٱلَّذِينَ ضَلَّ سَعْيُهُمْ فِى ٱلْحَيَوٰةِ ٱلدُّنْيَا وَهُمْ يَحْسَبُونَ أَنَّهُمْ يُحْسِنُونَ صُنْعًا

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."

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