The use of seven names for Hell in the Qur'ān, though often noted as proper to Muhammad, has never been fully explained. Yet the notion they stand for is an important element in the preaching of the Prophet of Islam and runs through the whole context of his message. A solution of their problem therefore may provide increased understanding not only of their author's inner sentiments during the Meccan years of persecution but also of the external influences that moulded his thought and expression over the two decades in which the Qur'ān was announced as a divine revelation to the people of Arabia.