In Ramadan of the fifth year of prophethood, the Prophet (Peace be upon him) went into the Holy Sanctuary where there was a large host of Quraish polytheists, including some notables and celebrities. Suddenly he began reciting Sūrah An-Najm (Chapter 41 The Star). The awe-inspiring Words of Allah descended unawares upon them and they immediately got stunned by them. It was the first time for them to be shocked by the truthful Revelation. It had formerly been the favourite trick of those people who wished to dishonour Revelation, not only not to listen to it themselves but also to talk loudly and insolently when it was being read, so that even the true listeners may not be able to hear. They used to think that they were drowning the Voice of Allah; in fact, they were piling up misery for themselves, for Allah's Voice can never be silenced, "And those who disbelieve say:
"Listen not to this Qur'an, and make noise in the midst of its (recitation) that you may overcome." [41:26].
When the unspeakably fascinating Words of Allah came into direct contact with their hearts, they were entranced and got oblivious of the materialistic world around them and were caught in a state of full attentiveness to the Divine Words to such an extent that when the Prophet (Peace be upon him) reached the stormy heart-beating ending:
"So fall you down in prostration to Allah and worship Him (Alone)." [53:62]
The idolaters, unconsciously and with full compliance, prostrated themselves in absolute god-fearing and stainless devotion. It was in fact the wonderful moment of the Truth that cleaved through the obdurate souls of the haughty and the attitude of the scoffers. They stood aghast when they perceived that Allah's Words had conquered their hearts and done the same thing that they had been trying hard to annihilate and exterminate. Their co-polytheists who had not been present on the scene reproached and blamed them severely; consequently they began to fabricate lies and calumniate the Prophet (Peace be upon him) alleging that he had attached to their idols great veneration and ascribed to them the power of desirable intercession.
Source: Al Bukhari mentioned a brief version of this story. Full version is found in Zadul-Ma'ad and Ibn Hisham.