Surah Al-Anfal, ayah 50

8:50

وَلَوۡ تَرَىٰٓ إِذۡ يَتَوَفَّى ٱلَّذِينَ كَفَرُواْ ٱلۡمَلَٰٓئِكَةُ يَضۡرِبُونَ وُجُوهَهُمۡ وَأَدۡبَٰرَهُمۡ وَذُوقُواْ عَذَابَ ٱلۡحَرِيقِ ٥٠

Walaw tarā idh yatawaffal-ladhīna kafarul-malā'ikatu yadribūna wujūhahum wa adbārahum wadhūqū 'adhābal-harīq

And if you could but see when the angels take the souls of those who disbelieved...453 They are striking their faces and their backs and [saying], "Taste the punishment of the Burning Fire.

Footnotes

453 This sentence is left incomplete for additional effect. Its conclusion is left to the imagination of the reader or listener and estimated as "...you would see a dreadful sight."