1400 years ago the Arabs used the same letters used today however their order changed. For example the letter "R ر" was the 20th letter in the alphabet; but hundreds of years later it became the 10th letter in the alphabet. The Quran uses the letter "R ر" as the 10th letter of the alphabet.
1400 years ago the Arabs used Abjadi system.
In the old Abjadi system "R ر" is the 20th letter. However hundreds of years later the Arabs changed their alphabetical order to the Hijā’ī system.
In the new Hijā’ī system "R ر" became the 10th letter of the alphabet. However this was portrayed in the Quran 1400 years ago. The Quran uses the letter "R ر" as the 10th letter of the alphabet. In chapter 108 the Arabic letter "R ر" points to the chapter number. It is found in the following locations: 16, 21, 28 and 43. If you add them up it gives you 108, the same number of the chapter.
So the letter "R ر" is pointing to the chapter number. Also in this chapter there are 6 recurring letters (used more than once). If you add their new alphabetical order (Hijā’ī) you get 108, the same number of the chapter. But 1400 years ago they used the old Abjadi order and their sum didn't point to the chapter number. Actually this chapter became number 108 several years after the prophet died; so he couldn't have known about number 108 either.
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