The earth-creature
The earth-creature ate Solomon's staff, and when he fell it became clear to the jinn that had they known the unseen they would not have tarried in the humiliating torment — a small insect that toppled a great tale in Solomon's kingdom.
In the Qur'an · 1
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فَلَمَّا قَضَيْنَا عَلَيْهِ ٱلْمَوْتَ مَا دَلَّهُمْ عَلَىٰ مَوْتِهِۦٓ إِلَّا دَآبَّةُ ٱلْأَرْضِ تَأْكُلُ مِنسَأَتَهُۥ ۖ فَلَمَّا خَرَّ تَبَيَّنَتِ ٱلْجِنُّ أَن لَّوْ كَانُوا۟ يَعْلَمُونَ ٱلْغَيْبَ مَا لَبِثُوا۟ فِى ٱلْعَذَابِ ٱلْمُهِينِ
And when We decreed death for him, nothing showed his death to them save a creeping creature of the earth which gnawed away his staff. And when he fell the jinn saw clearly how, if they had known the Unseen, they would not have continued in despised toil.