According to the Jewish Encyclopedia, Muhammad became increasingly hostile to the Jews over time. He grew to perceive that there were irreconcilable differences between their religion and his, especially when the belief in his prophetic mission became the criterion of a true Muslim." When the Jewish community challenged "the way in which the Quran appropriated Biblical accounts and personages; for instance, its making Abraham an Arab and the founder of the Kaa’bah at Mecca" Muhammad "accused them of intentionally concealing its true meaning or of entirely misunderstanding it, and taunted them with being." It is, however, important to note that neither the Quran, or Islamic exegesis called Abraham an Arab, and that the Jewish Encyclopedia was completed in 1906 and western scholarship on Islam at the time was heavily influenced by Orientalism.