Surah Saba' (The Sheba), Verse 14

فَلَمَّا قَضَیْنَا عَلَیْهِ الْمَوْتَ مَا دَلَّهُمْ عَلٰی مَوْتِهٖۤ اِلَّا دَآبَّةُ الْاَرْضِ تَاْكُلُ مِنْسَاَتَهٗ فَلَمَّا خَرَّ تَبَیَّنَتِ الْجِنُّ اَنْ لَّوْ كَانُوْا یَعْلَمُوْنَ الْغَیْبَ مَا لَبِثُوْا فِی الْعَذَابِ الْمُهِیْنِ ۟

Falammaa qadainaa 'alaihil mawta ma dallahum 'alaa mawtiheee illaa daaabbatul ardi taakulu minsa atahoo falammaa kharra tabaiyanatil jinnu al law kaanoo ya'lamoonal ghaiba maa labisoo fil 'azaabil muheen

“Then, when We decreed (Solomon's) death, nothing showed them his death except a little worm of the earth, which kept (slowly) gnawing away at his staff: so when he fell down, the Jinns saw plainly that if they had known the unseen, they would not have tarried in the humiliating Penalty (of their Task).”

Quran 34:14 (Yusuf Ali Translation)