﴿ وَمَا لَهُم بِهِۦ مِنْ عِلْمٍ ۖ إِن يَتَّبِعُونَ إِلَّا ٱلظَّنَّ ۖ وَإِنَّ ٱلظَّنَّ لَا يُغْنِى مِنَ ٱلْحَقِّ شَيْـًۭٔا ﴾

“and [since] they have no knowledge whatever thereof, they follow nothing but surmise: yet, behold, never can surmise take the place of truth.”

But they do not have any knowledge thereof of this claim. They follow in this respect nothing but conjecture which they have conjured up and indeed conjecture can never substitute for the truth that is to say when it comes to acquiring knowledge of that which one is required to have knowledge of.