Qur'ān 18:103 · Al-Kahf (الكهف)

قُلْ هَلْ نُنَبِّئُكُم بِٱلْأَخْسَرِينَ أَعْمَـٰلًا

Say, [O Muhammad], "Shall we [believers] inform you of the greatest losers as to [their] deeds?