(Of the jinn and of mankind) He says: Satan whispers in the hearts of the jinn just as he whispers in the hearts of mankind. The last two surah were revealed about Labid Ibn al-A'sam, the Jew, who used black magic on the Prophet (pbuh) and when the Prophet (pbuh) read these two surahs on Labid's black magic, Allah relieved him from it and it was as if he was untied from his fetters'.