How Is Quran Protected?
Quran was transmitted through ijma and tawatur – a mode of transmission that can’t be corrupted. Also from day one, people have committed the Quran to their memories, and such people continue to exist today. Moreover, the language of the Quran is a living language as opposed to a language that might have died with no way to interpret it in the present time. This is the arrangement of God in regards to protecting the Quran. It doesn’t mean that if someone changes the words in the book they will somehow miraculously revert back. What it means is that even if people make such modifications, there will always be a way to verify them.