Chapter THE FOURTH: Persecution.--The Emigration to

Abyssinia.--The Conversion of Umar, son of Al Khattab.--The Exile of the Banu Hasham.--The Decree of Expulsion destroyed by a Worm.--The Death of Abu Talib and Khadijah.--The Journey to Taif.--The Nocturnal Journey and Ascension.--How six Inhabitants of Yasrib were converted.--The two Oaths of the Aqabah.--The Plot against the Prophet.