"If we look to Islamic tradition for the answer to this question we might come to the conclusion that Muhammad's rivalry with the Jews of Medina led him to develop increasingly hostile anti-Jewish polemic. This is the sort of conclusion suggested by the Encyclopaedia of Islam article on Jews by Norman Stillman. Speaking of the Medinan period of Muhammad's career, Stillman comments: “During this fateful time, fraught with tension after the Hidjra, when Muhammad encountered contradiction, ridicule and rejection from the Jewish scholars in Medina, he came to adopt a radically more negative view of the people of the Book who had received earlier scriptures”."