(Maryam) 19 : 39
وَأَنْذِرْهُمْ يَوْمَ الْحَسْرَةِ إِذْ قُضِيَ الْأَمْرُ وَهُمْ فِي غَفْلَةٍ وَهُمْ لَا يُؤْمِنُونَ
And warn them about the Day of Regret when the matter will be Judged; and they are in heedlessness, and they are not believers.
On the Day of Judgment, since the Criterion of the judgment will be the Truth Adhikr, the falsehood following Fujjar will be the losers as explained in verses 7: 8-9 and 18: 103-106. These heedless people are falsely claiming that they are believers who will inherit Paradise. Instead, they will get Hell as a fine for their aimless and heedless life in this world as explained in verse 7: 179. See explanation 17: 97-98; 18: 103-106 and 25: 33-34.