Surah Yunus, Verse 36

وَمَا يَتَّبِعُ أَكۡثَرُهُمۡ إِلَّا ظَنًّاۚ إِنَّ ٱلظَّنَّ لَا يُغۡنِي مِنَ ٱلۡحَقِّ شَيۡـًٔاۚ إِنَّ ٱللَّهَ عَلِيمُۢ بِمَا يَفۡعَلُونَ٣٦

wamā yattabiʿu aktharuhum illā ẓannan inna l-ẓana lā yugh'nī mina l-ḥaqi shayan inna l-laha ʿalīmun bimā yafʿalūna

And most of them follow not except assumption. Indeed, assumption avails not against the truth at all. Indeed, Allāh is Knowing of what they do.