Al-Infitaar • EN-AL-JALALAYN
﴿ ثُمَّ مَآ أَدْرَىٰكَ مَا يَوْمُ ٱلدِّينِ ﴾
“And once again: What could make thee conceive what that Judgment Day will be?”
Again what would show you what the Day of Judgement is? — repeated to emphasise its enormity.