 Certain Arabist authors maintain that Bahira's works formed the basis of those parts of the Qur'an that conform to the principles of Christianity, while the rest was introduced either by subsequent compilers such as Uthman Ibn Affan or contemporary Jews and Arabs.The names and religious affiliations of the monk vary in different Christian sources.For example, John of Damascus (d.749), a Christian writer, states that Muhammad "having chanced upon the Old and New Testaments and likewise, it seems, having conversed with an Arian monk, devised his own heresy."