"Those who do not believe in it hasten it," in mockery and denial, "while those who believe are fearful of it," meaning: they are afraid. "Indeed, those who dispute concerning the Hour," they deny it, "are in extreme error," far from the truth.
﴿يَسْتَعْجِلُ بِهَا الَّذِينَ لَا يُؤْمِنُونَ بهَا﴾ استهزاءً وتكذيبًا ﴿وَالَّذِينَ آمَنُوا مُشْفِقُونَ مِنْهَا﴾ أَي: خائفون ﴿أَلا إِنَّ الَّذِينَ يمارون فِي السَّاعَة﴾ يكذبُون بهَا ﴿لَفِي ضَلالٍ بَعِيدٍ﴾ من الْحق.