And what can let you know what Saqar is?

It neither spares (anything inside it from burning) nor leaves (any disbeliever outside).

It will disfigure the skins.

Appointed on it are nineteen (wardens).

And We did not make wardens of the Fire but (from among) angels, and did not fix their number but as a test for those who disbelieve, so that those who are given the Book may come to believe, and those who believe may increase in belief, and so that those who are given the Book and those who believe may not doubt (its correctness), and so that those having malady in their hearts and the disbelievers say, "What has Allah meant by this (sentence that is as strange as a) proverb?" Thus Allah lets go astray whomever He wills, and leads to the right path whomever He wills. And no one knows the hosts of your Lord but He. And this is nothing else but a reminder for mankind.

Truly, I swear by the moon,

and by the night when it goes back,

and by the morning when it becomes bright,

it (saqar: Hell) is one of the greatest things

as a warning to the mankind