Surah Yunus (Jonah), Verse 36

وَمَا یَتَّبِعُ اَكْثَرُهُمْ اِلَّا ظَنًّا اِنَّ الظَّنَّ لَا یُغْنِیْ مِنَ الْحَقِّ شَیْـًٔا اِنَّ اللّٰهَ عَلِیْمٌۢ بِمَا یَفْعَلُوْنَ ۟

Wa maa yattabi'u aksaruhum illaa zannaa; innaz zanna laa yughnee minal haqqi shai'aa; innal laaha 'Aleemun bimaa yaf'aloon

“But most of them follow nothing but fancy: truly fancy can be of no avail against truth. Verily Allah is well aware of all that they do.”

Quran 10:36 (Yusuf Ali Translation)