Are the sayings of disbelievers or jinn mentioned in the Holy Quran as they are, or in another style to harmonize with the Quran?

Everything mentioned in the Quran, whether news or نقل (narration) from those who came before or those who will come after, is truth and certainty, without addition or omission. This applies whether the narration is about people of faith or disbelief, Arabs or non-Arabs, humans or jinn, birds or beasts; all of it is truth and justice. This is confirmed by His (the Almighty's) saying: (And who is truer in statement than Allah?), and His saying: (And who is truer in speech than Allah?), and His saying: (And the word of your Lord has been fulfilled in truth and in justice. None can alter His words, and He is the All-Hearing, the All-Knowing). The Noble Quran was revealed in a clear Arabic tongue, so the words came in Arabic, but the meaning is the same, neither increased nor decreased.