AL MUDDATSTSIR (ORANG YANG BERKEMUL) — Ayat 9

Tafsir

{That} meaning the time of the knocking {on that day} is a substitute for what preceded it, the subject, and it was built because it was added to something that was not established, and the predicate of the subject is {a difficult day}, and the factor in if is what the sentence indicates, the matter becomes difficult.