Surah An Najm Tafseer

وَمَا لَهُم بِهِ مِنْ عِلْمٍ

But they have no knowledge thereof.

meaning, they have no correct knowledge testifying to their statements. What they say is all lies, falsehood, fake and utter atheism,

إِن يَتَّبِعُونَ إِلاَّ الظَّنَّ وَإِنَّ الظَّنَّ

لَاا يُغْنِي مِنَ الْحَقِّ شَيْيًا

They follow but conjecture, and verily, conjecture is no substitute for the truth.

meaning, conjecture is of no benefit and never takes the place of truth.

In a Hadith recorded in the Sahih, the Messenger of Allah said,

إِيَّاكُمْ وَالظَّنَّ فَإِنَّ الظَّنَّ أَكْذَبُ الْحَدِيث

Beware of suspicion, for suspicion is the most lying speech.

The Necessity of turning away from the People of Misguidance

Allah's statement