Surah An-Najm, ayah 28

وَمَا لَهُم بِهِۦ مِنۡ عِلۡمٍۖ إِن يَتَّبِعُونَ إِلَّا ٱلظَّنَّۖ وَإِنَّ ٱلظَّنَّ لَا يُغۡنِي مِنَ ٱلۡحَقِّ شَيۡـٔٗا ٢٨

Wamā lahum bihī min 'ilmin in yattabi'ūna illaz-zanna wa innaz-zanna lā yughnī minal-haqqi shay'ā

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