3.In Makki surahs...
3.In Makki surahs, whenever the audience has been addressed, mostly the words "O People" or "O Children of Adam" have been used; whereas in Madani surahs, mostly, the words "O you who believe" have been used. 4.All the surahs in which one is ordered to (or recommended to) do sajdah were revealed at Makka- thus emphasizing the worship of One and Only Allah. 2.Writing & Collection of the Qur'an The Qur'an was committed to writing from the very beginning.
There are at least 52 verses in which the Qur'an is called "al-Kitab" (the written thing; the book). In the beginning, at the time of revelations, the Holy Prophet used to repeat the wordings recited by Gabriel, lest he forgot something. Allah assured him that there was no need to worry: Move not thy tongue with it {the Qur'an} to make haste therewith. Surely on us is its collection and its recital. (75:16-17) Thus, Allah Himself was responsible to collect and promulgate this Book.
In another ayah, Allah says: "And it is a Book of exalted power. No falsehood can approach it from before or behind it". (41:41-42) SCRIBES: Some companions were specially entrusted to write down the surahs and 'ayat' revealed to the Holy Prophet. Some of them were 'Ali bin Abi Talib, Ubayy bin Ka'b, Abdullah bin Rawahah, Khalid bin Sa'id bin al-As, and in later period Zayd bin Thabit among others.
As soon as a revelation was received, the Holy Prophet dictated it to one or more of the above-mentioned scribes. POSITION OF AYAT: At the time of dictation the Holy Prophet himself used to fix the position of that ayah or ayat in the surahs. The Qur'an even before its revelation, was arranged as a Book in the "Preserved Tablet لوح) محفوظ); but the events during the ministry of the Holy Prophet necessitated revelation of ayat in a different order.
But the Holy Prophet knew the original arrangement of the "Preserved Tablet" and directed the revealed ayat to be written accordingly. It is for the reason that we find Madani 'ayat' in Makki surahs and vice versa. MEMORIZING THE QUR'AN: The Holy Prophet used to stress the importance and reward of committing the Qur'an to memory. And hundreds of people responded to this prophetic enjoinment.
As the eagerness of the people for memorizing the Holy Book increased, the Holy Prophet selected four principal instructors who learnt the Qur'an under his personal guidance and then trained the others, who in their turn, used to teach it to still others. Those four were: 1.'Abdullah bin Mas'ud.