(Original post by Rouz)
Where did you get this information? This is completely incorrect.
Muhammad DID dictate to his followers/scribes while he was alive, and made them re-read it all to him to ensure they had wrote it properly and didnt add what they pleased.
The Quran existed in written form during his life, but on writing material and not in one bound book. The reason is wasnt gathered into a book in his life is because he could receive revelation at any time and the last revelation was a few days before his death. If it was already in book form, people might not have added those verses which he received a few days before he passed away.
Here are some useful books and lecture series
Intro to Sciences of the Quran by Ahmed von Denfer
And a version by yasir qahdi (ive only read parts of this one, but ive read von denfers one in full)
Heres a few relevant sections from the first book...but i really recommend you read it all.
"The Qur'an Dictated by the Prophet
The Qur'an was not only written down by those Companions who did so on their own initiative. Indeed, the Prophet,
when a revelation came, called for the scribe and dictated to him. The Prophet while in Madina had several such scribes,
[M. M. A'zami, in his book Kuttab al-Nabi (Beirut, 1393/1974) mentions 48 persons who used to write for the Prophet.]
among whom Zaid bin Thabit was very prominent.
Narrated al-Bara': There was revealed 'Not equal are those believers who sit (at home) and those
who strive and fight in the cause of Allah' (4: 95). The Prophet said: 'Call Zaid for me and let him
bring the board, the ink pot and the scapula bone (or the scapula bone and the ink pot).' Then he said:
'Write: Not equal are those believers ... [Bukhari, VI, No. 512; also VI, No. 116-18.]
It is also reported that material upon which the revelation had been written down was kept in the house of the Prophet.
[Suyuti, Itqan, I, p. 58.]
Written during the Prophet's Lifetime
Another report informs us that when people came to Madina to learn about Islam, they were provided with 'copies of the
chapters of the Qur'an, to read and learn them by heart'. [Hamidullah, M.: Sahifa Hammam ibn Munabbih, Paris, 1979, p.
Further evidence for the existence of the Qur'an as a written document during the lifetime of the Prophet comes from the
'Abd Allah b. Abu Bakr b. Hazm reported: The book written by the apostle of Allah for 'Amr b. Hazm
contained also this that no man should touch the Qur'an without ablution.' [Muwatta', No. 462.]
Malik said: And no one should carry the mushaf by its strap, nor on a pillow, unless he is clean. And even
if this be allowed to carry it in its cover, it is not disliked, if there is not in the two hands which carry it,
something polluting the mushaf, but it is disliked for the one who carries it, and he is not clean, in honour
to the Qur'an and respect to it. Malik said: The best I heard about this is the verse 'None shall touch it
but those who are clean' (56: 79).' [Muwatta', Arabic, p. 204.]
The commentary to the muwatta' explains that the book referred to as written by the Prophet (which means of course
written upon his instruction) was sent with some Muslims for instruction in Islam of the people of Yemen. [Muwatta',
Arabic, p. 204.] "