The Divine Promise and Miracle of the Glorious
Quran's Preservation in Text and Pronunciation:
Allah Almighty Said in the Glorious Quran regarding preserving the Holy Quran's Text and Pronunciation the following:
The Noble Verses above give Divine Promise from Allah Almighty:
1- To send down the Holy Quran to mankind.
2- To protect the Holy Quran from all corruption.
3- To preserve the way the Holy Quran's recitation.
(i)- Prophet Muhammad was trained by Angel Gabriel on how to recite the Holy Quran.
(ii)- The Prophet was further instructed to not be careless with his tongue when he recites that Holy Quran.
(iii)- The Prophet was also instructed to not be haste when it comes to reading the Holy Quran. He should read it with extreme care.
Important Note: The Sunni Muslims, who make up more than 90% of all Muslims, today have perfected the recitation of the Holy Quran. We have yearly tournaments with big prizes on who memorizes the Holy Quran the best, not just in Holy Words, but also in the pronunciation of the Holy Words.
4- To make the Holy Quran clear and an official Book for all Muslims. Noble Verse 75:19 "ثم ان علينا بيانه" literally translates as "It is Upon Us to manifest it, make it clear, make it known.
(i)- The Arabic Word بيانه is derived from بيان , which literally means:
When a government official, such as the president or any senior person makes an official statement, he sends out a بيان bayan. Clearly, this Divine Promise by Allah Almighty had come true. All Praise and Glory and Thanks are due to Him, Alone! The Holy Quran today is indeed perfectly preserved in both text and pronunciation. No religious scripture on the face of this earth has this.
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Quran's STUNNING Divine Miracles: 
Here are some examples from the 1000s of stunning Numerical and Scientific Miracles in the Glorious Quran. Allah Almighty also promised in several Divine Prophecies that He will show the Glorious Quran's Miracles to mankind:
1- The root letters for "message" and all of its derivatives occur513 times throughout the Glorious Quran. Yet, all Praise and Glory are due to Allah Almighty Alone, the Prophets' and Messengers' actual names (Muhammad, Moses, Noah, Abraham, Lot etc....) were also all mentioned 513 times in the Glorious Quran. The detailed breakdown of all of this is thoroughly listed here. This Miracle is covered in 100s (hundreds) of Noble Verses.
2- Allah Almighty said that Prophet Noah lived for950 years. Yet, all Praise and Glory are due to Allah Almighty Alone, the entire Noble Surah (chapter Noah) is exactly written in 950 Letters. You can thoroughly see the accurate count in the scanned images.
Coincidence? See1,000s of examples .slave of GOD in both the OT and NT.