For the guardians of Hellfire, to be responsible for punishing its inhabitants. If you say: Why was it not said: those in the fire for its guardians? I say:

Because mentioning Hellfire is terrifying and horrifying. It is possible that Hellfire is the deepest of the fires, from their saying: a well of Hellfire is deep. And their saying about Al-Nabigha: Hellfire, a name given to it, because they claim that poetry is uttered on the tongue of the one attributed to it, thus it is deep in its knowledge of poetry.

As Mahmoud said: If you say: Why was it not said for its guardians? It was answered that mentioning Hellfire is terrifying and horrifying, and it is possible that Hellfire is the deepest of the fires from their saying: a well of Hellfire, meaning: deep. Al-Nabigha used to call it Hellfire due to its depth in poetry. Ahmad said: The first is more apparent, and the emphasis in it is from two aspects: one is placing the apparent in the place of the implied, which he referred to, and the second is mentioning it as something singular in appearance, more horrifying than the first, because Hellfire is more horrifying than the fire, as the fire is general, and Hellfire is the most severe of them.

As Abu Nuwas said about Khalaf Al-Ahmar:

Qalidham from the depths of knowledge, Or all knowledge perished with Khalaf... He who does not count knowledge except what he knows A narrator who does not gather from the books... Qalidham from the depths of knowledge, For Abu Nuwas laments Khalaf Al-Ahmar, son of Ahmad. And perished a king, and he who does not count knowledge as a description of Khalaf, meaning: he does not consider knowledge except what he has known with certainty and received through teaching. Or he knows it through deduction from the principles of the predecessors, thus he is a narrator, meaning: one who narrates much and does not take from the books, likening it to a fruitful garden along the path of metaphor, and gathering is an illusion. And Qalidham: the well with abundant water.

And Al-‘Aylam: the pit with much water. And Al-Khaf: the deep and far-reaching, he likened him to that in a profound comparison, due to his vast knowledge and understanding of distant and hidden meanings.

And in it are the fiercest of the disbelievers and the most tyrannical among them. Perhaps the angels assigned to punish those are more responsive to the call due to their increased closeness to Allah, the Exalted. Therefore, the people of the fire intentionally seek supplication from them. Did not the obligation of proof and reproach come to you, and that they left behind them times of supplication and pleading, and neglected the means by which Allah responds to supplications? They said: So call you, for we do not dare to do that nor intercede except under two conditions: the one for whom intercession is made is not an oppressor, and permission for intercession is granted while considering its time, which is before the decisive judgment between the two groups. And their saying: So call is not for the hope of benefit, but to indicate disappointment. For if the close angel does not hear his supplication, how will the supplication of the disbeliever be heard?