يَجْعَلُونَ أَصَابِعَهُمْ فِي آذَانِهِمْ مِنَ الصَّوَاعِقِ حَذَرَ الْمَوْتِ (Quran 2:19)
They put their fingers in their ears because of the thunderclaps, fearing death.
The action is putting fingers in the ears. حَذَرَ الْمَوْتِ states why they do it: caution against death. Thus حَذَرَ is the mansub verbal noun functioning as maf'ul lahu.
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Maf'ul Lahu: The Reason for an Action
يَجْعَلُونَ أَصَابِعَهُمْ فِي آذَانِهِمْ مِنَ الصَّوَاعِقِ حَذَرَ الْمَوْتِ (Quran 2:19)
They put their fingers in their ears because of the thunderclaps, fearing death.
The action is putting fingers in the ears. حَذَرَ الْمَوْتِ states why they do it: caution against death. Thus حَذَرَ is the mansub verbal noun functioning as maf'ul lahu.