Surat An-Najm (The Star) - النجم

وَمَا لَهُم بِهِۦ مِنْ عِلْمٍ إِن يَتَّبِعُونَ إِلَّا ٱلظَّنَّ وَإِنَّ ٱلظَّنَّ لَا يُغْنِى مِنَ ٱلْحَقِّ شَيْـًٔا ﴿٢٨﴾

And they have no knowledge of it; they do not follow anything but conjecture, and surely conjecture does not avail against the truth at all.