[These letters (Nûn, etc.) are one of the miracles of the Qur'ân, and none but Allâh (Alone) knows their meanings].
By the pen and what the (angels) write (in the Records of men).
8. So (O Muhammad sallallaahu `alayhi wa sallam) obey not the deniers [(of Islâmic Monotheism those who belie the Verses of Allâh), the Oneness of Allâh, and the Messenger of Allâh (Muhammad sallallaahu `alayhi wa sallam), etc.]
51. And verily, those who disbelieve would almost make you slip with their eyes through hatredness when they hear the Reminder (the Qur'ân), and they say: "Verily, he (Muhammad sallallaahu `alayhi wa sallam) is a madman!"