when various parts which they brought to his notice were revealed, and so the portions got mixed   
up together without any regard to dates or place. Thus when Muhammad bin Sirin asked 'Akrama   
whether the Qur'an was to be in chronological order, he said: 'Collect it just as it came down,   
first portion first, second second, and so on; if men and genii tried they could not do it in this   
order.'
    
In fact, the age and the men were uncritical, and the only apparent rule followed was to arrange   
the portions of a Sura in the best way possible and then to put the longer Suras first in order and   
the shorter ones last, without any reference to chronological sequence.
  
Some of the Suras have single letters prefixed to them, the meanings of which it is impossible to    
determine. These are the letters A.L.M.; A.L.M.R.; A.L.R.; Ta. Ha.; Kaf, Ha Ya, 'Ain, Sad.1    
This latter set occurs in the beginning of Sura Maryam (xix) which contains the histories of John    
the Baptist and of Christ, and which was recited to the King of Abyssinia in the presence of the    
ambassadors whom Muhammad sent to him. This had led Dr. Sprenger to suppose that these mystic words    
stand for a Christian symbol, just as the letters I.N.R.I. stand for Jesus Nazarenus Rex Judæorum.    
So he would make out of these letters the following sentence:   
  
  
In Arabic, it is not necessary to use the first letter of a word for an abbreviation.2    
The most prominent letter in a word can be taken, so Dr. Sprenger takes 
 that is, King of the Jews. 3   
   
This is very curious but not at all probable. Ibn Khaldun says: 'God has placed these letters    
in several Suras to show the impossibility of imitating the style of the Qur'an. He also says