And It is in the Mother of the Book kept with Us—surely the Supreme, the Wise.
Mother of the Book is the Book recorded in the Disk kept safely, as told in verses 85: 21-22. Since Surath Al-Fathiha contains the essence of the Lord’s Book as a whole, It is also known as the Mother of the Book. As explained in verses 16: 43-44 and 21: 24, the Book revealed from the Lord to all 313 Messengers was Adhikr. But the last Messenger and Prophet, Muhammad, received Al-Kithab—Mother of the Book—including Fathiha and Adhikr. Adhikr is the Best Interpretation of the Lord’s Book, and the Arabic Quran-reading Fujjar who do not testify to It will be dragged prone on their faces into Hellfire; such are in the worst places and are the most strayed, as explained in verses 16: 89; 17: 97-98; and 25: 33-34. See explanation 2: 2; 13: 39; 15: 87; and 39: 23.