And those who don’t have the Knowledge say: “Why doesn't Lord Allah speak to us or bring to us a Sign!” Just like that, those who were before them told similar to their words, both of their hearts were synchronized; verily We have cleared verses for the people who have confirmed belief.
The Knowledge mentioned in 62 places such as in 2: 32, 145; 3: 7, 19; 11: 14; 12: 22, 68; 27: 15, 40; 28: 80 and 29: 49 is Adhikr. Adhikr is the Wise Reminder as told in verse 3: 58. It is told in verses 6: 90; 38: 87 and 81: “Adhikr is nothing except a Reminder for the entire world”. Adhikr is the true Knowledge that explains everything as told in verse 16: 89. Adhikr contains all three hundred and twelve previous Books and their upright Explanation as told in verse 16: 44. So without testifying Adhikr nobody can become a believer. Adhikr is a great Sign for the believers who are endowed with Knowledge as told in verses 29: 47-51.
The Arabic Quran reading Fujjar are hiding and rejecting even the forty names of Adhikr from mankind. They are having doubts concerning Lord, Angels, Messengers, Prophets, soul, Spirit, two deaths, two births, the first creation in Paradise, the aim of life, Adhikr, Paradise, inherits of Paradise, the Hell, inherits of Hell, etc. So, the Fujjar are in never-ending doubt concerning every matter. Fujjar are denoted as the worst creatures in verse 8: 22 is not due to not hearing and talking about the Arabic Quran but Adhikr. Fujjar are filthy, so Adhikr will increase them nothing except filth over filth as told in verses 9: 28, 95, and 125. Each among Fujjar will die by seeing Satan gloomily as told in verse 75: 24. And on the Day of Judgment, there will be a veil between Lord and them as told in verse 83: 15. So they will never see the Lord forever. See explanation 2: 4, 55, and 85; 6: 111 and 12: 31.