The Holy Quran was not revealed all at once, different verses (ayats) of Holy Quran were being revealed at different time periods and therefore it was not possible in the beginning to write it properly and preserve verses in a form of book So during the initial days of religion Islam, major and basic emphasis was laid on memorizing the revealed verses as a means of preserving the Holy Quran.
When revelation used to come in the start, the Prophet (PBUH) would tend to repeat it instantly so that the verse memorized well enough. The blessed chest of the Prophet (PBUH) was the most secured and protected place to preserve the Holy Quran, in this way there was not any chance of even a single mistake, editing or alteration.
It is the beauty of Holy Quran that some ayats were revealed in link with some particular occasion. Revelations of Holy Quran were also made in a particular way or sequence i.e. verses for some basic and essential topics like faith and basics of religion Islam were revealed earlier as compared to ayats for other issues. Arabs of that time were deeply involved in paganism for many decades. Uprooting such strong and deep cultural roots was not an easy task to do in a day. Initial need was to cut and weaken their faith on worshipping idol and build up strong and true faith on monotheism by proclaiming shahadat and accepting one ALLAH Almighty. Once their minds were done then fill the space for some noble deeds. Then revealed the ayahs regarding acts of individual like having halaal food and avoid haraam, illegal relationships, consumption of alcohol or liquor, etc.
In short, memorization of the Holy Quran was given more importance and emphasis in early religion Islam as this was the only trustworthy and protected way to preserve Holy Quran given the conditions of that time. The reason behind this is that the number of people was illiterate and there were very limited people who could read or write in those days.
Therefore, in that situation, if the procedure of writing was taken to be sufficient it would not have been possible to spread the Holy Quran on large scale nor to preserve and protect it reliably. In its place,ALLAH Almighty had blessed the people of Arab with a great memory of such dimensions that many poetic lines would easily rest in the memory of Arab peoples after another. Therefore, this power of memorization was well utilized for the preservation and protection of the Holy Quran and it was done through the chapters and verses of the Holy Quran reached all over in to the different corners of Saudi Arabia.
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