(Is it a wonder for mankind that We have sent Our revelation to a man from among themselves (saying): "Warn mankind, and give good news to those who believe that they shall have with their Lord the rewards of their good deeds" (But) the disbelievers say: "This is indeed an evident sorcerer!") (10:2). And Allah says here:
In verse 6, it was said: وَانطَلَقَ الْمَلَأُ مِنْهُمْ أَنِ امْشُوا وَاصْبِرُوا عَلَىٰ آلِهَتِكُمْ (And the leaders among them went forth saying (to their followers)," Walk away (from the Prophet) and stay firm on (adhering to) your gods - 12). This is pointing out to the event mentioned above that, once they heard the call to pure monotheism (tauhid), they left the meeting.
Tazkirul Quran
Maulana Wahiduddin KhanOn ayahs 4–9
The Prophet Muhammad is a great name today, because subsequent history has glorified him. But when, in the seventh century A.D. he announced his prophethood, it was difficult for people to believe that this ordinary-looking person was chosen to receive God’s revelations. It is crucial to understand that once history has taken shape, even a blind man can recognise a prophet, but before history takes shape immense sincerity is required to acknowledge a prophet. The exceptionally different style of the Quran used to stun its opponents, but the ordinary image of the bearer of the Quran would cast them into doubt. Bent on rejecting him, these people used to denigrate the Prophet in various ways, called him a magician or a liar. They could not reconcile themselves to the possibility of their great men being in the wrong as against an ordinary man.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.