The Deniers will never believe until They see the Torment
Allah says: `thus We caused denial, disbelief, rejection and stubbornness to enter the hearts of the sinners.'
لاَ يُؤْمِنُونَ بِهِ
(They will not believe in it), i.e., the truth,
حَتَّى يَرَوُاْ الْعَذَابَ الاٌّلِيمَ
(until they see the painful torment.) means, when their excuses will be of no avail, and the curse will be upon them, and theirs will be an evil abode.
فَيَأْتِيَهُم بَغْتَةً
(It shall come to them of a sudden,) means, the punishment of Allah will come upon them suddenly,
(while they perceive it not. Then they will say: "Can we be respited") means, when they see the punishment, then they will wish they had a little more time so that they can obey Allah -- or so they claim. This is like the Ayah:
It is brought by the Trusted Spirit down [ 193] to your heart, so that you become one of the warners [ 194] in plain Arabic language. [ 195] And of course, it is (mentioned) in the scriptures of the former people. [ 196]
The words بِلِسَانٍ عَرَبِيٍّ مُّبِينٍ (in plain Arabic language - 195) in these verses makes it clear that Qur'an is only that which is in Arabic language. Any translation of a passage or the whole of Qur'an in any language cannot be called Qur'an. But the next sentence وَإِنَّهُ لَفِي زُبُرِ الْأَوَّلِينَ (And of course, it is [ mentioned ] in the scriptures of the former people - 196) does not seem to be in consonance with it, because the pronoun 'it' is apparently refers to the Qur'an and means that the Qur'an was also in the earlier scriptures, i.e. in Torah, Injil and Zabur. It is also well known that the earlier books, namely Torah, Injil and Zabur, were not in the Arabic language. Hence the inclusion of the meanings of Qur’ an in them is referred in this verse as ` Qur'an'. Answer to this apparent contradiction is that according to majority of the Ummah, sometimes even the subject matter of the Qur’ an is called Qur'an in a general sense, because the real purpose of a book is the subjects it deals with. The statement that earlier books also contained Qur'an is in this sense only that they included some Qur'anic subjects. This statement is also endorsed by many narrations of hadith.
Though the Quran has been revealed in a language of human beings, its literary superiority is extraordinary, so much so that its language itself provides proof of the Quran being a superior Divine discourse of God. Another proof of the Truth of the Quran is that, the prophets, born long before the revelation of the Quran,had predicted it. This prediction is found even today in the Torah, Zabur (Book of Psalms) and Injeel (Bible). It was on the basis of these predictions that a number of the Christian and Jewish scholars of those days (for example ‘Abdullah ibn Salam) embraced the faith. This trend continues even today. The revelation of the Divine discourse of God with such special arrangements, could be only for a certain special purpose and this purpose is to warn the people of the coming Day of Judgement: Just as warning about the Hereafter was the special purpose of all the previous revealed Books, so is it the special purpose of the Quran.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.