There are many conflicting readings on the text of the Quran as Arthur Jeffery has demonstrated in his book, Material for the History of the Text of the Quran" (New York, Russell F. Moore, 1952). Mentions Variant readings in the Koran: Dashti, 23 Years, p. 28 Mentions Variant readings in the Koran: Mandudi, Meaning of the Quran, pp. 17-18
Wazo la “kumkufuru Roho” limetajwa katika Mariko 3:22-30 na katika Mathayo 12:22-32. neno kufuru linaweza kuelezwa kwa ujumla kama, “tabia iliyo kando”. Hilo neno laweza kutumika kwa dhambi kama zile za kumlaani Mungu au kwa makusudi ya kutotambua mambo yanohusiana na Mungu.