Those are the cities, We have explained the news upon you about them, and surely their Messengers had come to them with Explanations, then they were not believing with what they were rejecting before, just like that Lord Allah is sealing upon the hearts of disbelievers.
It is told in verse 40: 85: "But never did their faith benefit them once they saw Our punishment; it is the established way of Lord that He practiced among His servants, and just like that the disbelievers became the losers". To every country Messengers had come with the same Message Adhikr as told in verses 16: 43; 21: 2, 7, 24, and 41: 43. But the hypocrites and their blind followers didn't accept the Messengers and the Message sent with them. Thus when all the people became the wrongdoers and transgressors except a few, the Three-Time-Knower Lord inspired the Messengers to pray to the Lord for a decision between the believers and the disbelievers. Then Lord saved Messenger and the believers with them while He punished the disbelievers as explained in verses 4: 47 and 6: 47. At last, Messenger Muhammad was deputed with Adhikr which contains all 312 previous Books and their upright Explanations as explained in verse 16: 44. From the deputation of Messenger Muhammad till the last Day, all mankind of the entire world belongs to his community. But after the thirty years of his departure, the Arabic Quran reading Fujjar considered only the body of the Book without considering its soul. They have been teaching their children the Lord’s Book just as Jews in Medina during Messenger's time were teaching the Book ‘Thora’ to their children. The Fujjar are learning, teaching, following, and conveying different books written by twenty-nine pseudo-prophets and hypocrites as explained in verses 2: 78-79. These Fujjar Mujirim people neither utilize Adhikr nor give It to others. So Lord has sealed their hearts as explained in verses 2: 6-7, and they will never become believers as told in verse 10: 33. Adhikr is filth for these filthy Fujjar and It will increase them nothing except filth over filth as explained in verses 9: 28, 95 and 125. Adhikr is Guidance, Mercy, and Herald only for true Muslims who submitted wholly to Lord. See explanation 2: 254; 4: 163-166, and 6: 115-117.