And they have thereof no knowledge. They follow not except assumption, and indeed, assumption avails not against the truth at all.
The Saheeh International Quran Translation
وَمَا لَهُم بِهِۦ مِنْ عِلْمٍ إِن يَتَّبِعُونَ إِلَّا ٱلظَّنَّ وَإِنَّ ٱلظَّنَّ لَا يُغْنِى مِنَ ٱلْحَقِّ شَيْـًٔاAnd they have thereof no knowledge. They follow not except assumption, and indeed, assumption avails not against the truth at all.