وَإِن يَكادُ الَّذينَ كَفَروا لَيُزلِقونَكَ بِأَبصارِهِم لَمّا سَمِعُوا الذِّكرَ وَيَقولونَ إِنَّهُ لَمَجنونٌ

And indeed, those who disbelieve would almost make you slip with their eyes when they hear the message, and they say, "Indeed, he is mad."