The movement of the Jews for the subversion of Islam from within was spear headed by Abdullah b Saba. He was a Jew of Yemen. At one time the Jews had ruled over Yemen. The movement launched by Abdullah b Saba aimed at the restoration of the glory of the Jews by subverting Islam from within. Abdullah b Saba came to Madina and was converted to Islam. He posed as a champion of Islam, and pretended to live a life of piety according to the injunctions of Islam. He had considerable funds raised by the Jews at his disposal and this money he distributed among the poor. Within a short time Abdullah b Saba became popular with the Muslims.