The Holy Quran
The Quran is the pure word of God. Not one word therein is not divine. Not a single word has been deleted from its text. The Noble Quran has been handed down to our age in its complete and original form since the time of Prophet Muhammad.
From the time the Book began to be revealed, the Holy Prophet had dictated its text to the scribes. Whenever some Divine Message was revealed, the Holy Prophet would call a scribe and dictate its words to him. The written text was then read out to the Holy Prophet, who, having satisfied himself that the scribe has committed no error of recording, would put the manuscript in safe custody.
The Holy Prophet used to instruct the scribe about the sequence in which a revealed message was to be placed in a particular Surah (chapter). In this manner, the Holy Prophet continued to arrange the text of the Quran in systematic order till the end of the chain of revelations. Again, it was ordained from the beginning of Islam that a recitation of the Holy Quran must be an integral part of worship. Hence the illustrious Companions would commit the Divine verses to memory as soon as they were revealed. Many of them learned the whole text and a far larger number had memorized different portions of it.