يَحْذَرُ الْمُنَافِقُونَ أَن تُنَزَّلَ عَلَيْهِمْ سُورَةٌ تُنَبِّئُهُم بِمَا فِي قُلُوبِهِمْ ۚ قُلِ اسْتَهْزِئُوا إِنَّ اللَّهَ مُخْرِجٌ مَّا تَحْذَرُونَ (64)
(9:64) The hypocrites dread lest a surah should be sent down to Muslims revealing to them what is in their hearts. *72 O Prophet, say to them, "Go on mocking, Allah will surely bring to light the very thing you are dreading."
*72) The hypocrites were afraid that their secret plans would be disclosed in the Qur'an to their great discomfiture. Though they did not believe that the Holy Prophet was a Messenger of Allah, they were convinced from their experience of the last nine years or so that he possessed some supernatural powers by which he learnt their hidden secrets, and revealed these through the Qur'an (which according to them was written by himself).