“Let him take his seat in the Fire” is grammatically imperative but functions as a severe threat, not a command to perform the act. “He enters the Fire” expresses a warning in declarative form. Al-Nawawī interprets such warnings in relation to liability to punishment; they do not by themselves determine every individual’s final, eternal fate.
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How to understand the form of the threat
The Grave Warning Against Lying About the Prophet: Narration, Intent and Critical Duty
“Let him take his seat in the Fire” is grammatically imperative but functions as a severe threat, not a command to perform the act. “He enters the Fire” expresses a warning in declarative form. Al-Nawawī interprets such warnings in relation to liability to punishment; they do not by themselves determine every individual’s final, eternal fate.