The message of Quran is as ancient as humankind
The message of the Quran and its content has been stressed by Allah ﷻ in all the books of guidance delivered to prophets and messengers that have ever lived throughout the humankind history. Allah ﷻ reminds us of this fact: “And, verily, [the essence of) this [revelation] is indeed found in the ancient books of divine wisdom [as well]. Is it not evidence enough for them that [so many] learned men from among the children of Israel have recognized this [as true]?” In this verse Muhammad Asad translates the term zabur as "ancient books of divine wisdom". The core principles enunciated in the Quran are still found in many scriptures of ancient civilizations such as those of Hindus and Magians (Zoroastrians) especially books of Bible, despite the fact that these books underwent considerable changes, additions and omissions throughout history. The core principles found in previous scriptures and taught by the Quran may be summed up as following:
Allah ﷻ is one and there is none worthy of worship except Him. The Quran condemns idolatry and associationism of any being or of any sort with worship and obedience due only to Allah ﷻ. It also condemns sinful way of life and encourages the performance of good deeds and righteous way of life. All the prophets were humble servants of Allah ﷻ and none of them was proud to refer themselves as being divine or claimed to be god. Everything in the entire universe comes from Allah ﷻ, the Creator, including everything and ourselves will perish with time. There is a resurrection day and judgment and accountability of how humans spend their temporary existence on earth. There is a belief in angels, of paradise for the blessed and those who submitted to Allah’s guidance, hell for the evil and those who rejected Allah’s revelations.
Any person who has read their previous scriptures without bias towards Islam, regardless of whichever non-Muslim denomination they belong to, would agree that all the above have been clearly emphasized in their own ancient books. This informs us that none of these fundamentals are new that Quran teaches. Since the content of the Quran’s message was proclaimed by all prophets to have ever lived before it, therefore it would be correct to say that the essence of Quran's message was taught by all prophets and messengers.
 Al Quran 26:196–197 – Asad Translation.