An-Najm 53:28

Wama lahum bihi min AAilmin inyattabiAAoona illa aththanna wa-innaaththanna la yughnee mina alhaqqishay-a

And they have thereof no knowledge. They follow not except assumption, and indeed, assumption avails not against the truth at all.

They do not have knowledge about it. They follow nothing but conjecture, and conjecture is of no avail in (the matter of) Truth.