With the help of computers, he carried out a numerical analysis of the Quran, which according to him clearly proved that it is of divine origin.[122] The number 19, which is mentioned in chapter 74 of the Quran as being "one of the greatest miracles" played the fundamental role,[123] which according to Khalifa can be found everywhere in the structure of the Quran, and the fact that a Quranist discovered such a big miracle proved the Quranist approach.[124] Some objected to these beliefs and, in 1990, Khalifa was assassinated by someone associated with the Sunni group Jamaat ul-Fuqra.[125]