النجم — An-Najm Ayat 28
وَمَا لَهُمْ بِهٖ مِنْ عِلْمٍۗ اِنْ يَّتَّبِعُوْنَ اِلَّا الظَّنَّ وَاِنَّ الظَّنَّ لَا يُغْنِيْ مِنَ الْحَقِّ شَيْـًٔاۚ
Wa mā lahum bihī min ‘ilm(in), iy yattabi‘ūna illaẓ-ẓann(a), wa innaẓ-ẓanna lā yugnī minal-ḥaqqi syai'ā(n).
"And they have thereof no knowledge. They follow not except assumption, and indeed, assumption avails not against the truth at all."