﴿ إِنَّهُمْ كَانُوا۟ لَا يَرْجُونَ حِسَابًۭا ﴾

“Behold, they were not expecting to be called to account,”

جَزَاءً وِفَاقًا (this being a recompense in full accord [ with their deeds ]..78:26). The punishment given to them in Hell will be based on justice and equity - a fitting recompense - on account of their false beliefs and evil deeds. They will not be wronged in the least.