Development of the New Testament canon a heretic and in the early 4th century Bishop Theodoretus of Cyrrhus and Bishop Rabbula of Edessa (both in Syria) rooted out all copies they could find of the Diatessaron and replaced them with the four canonical Gospels (M 215). As a result, no early copies of the Diatessaron survive—although a very early fragment suggests it would have been crucial evidence for the true state of the early Gospels (see IX). By the 5th century, the Syriac Bible, called the Peshitta, was formalized, accepting Philemon, along with James, 1 Peter and 1 John, but excluding 2 John, 3 John, 2
Historical reliability of the Gospels exception, although the author simply refers to himself as "the disciple Jesus loved" and claims to be a member of Jesus' inner circle. During the following centuries, each canonical gospel was attributed to an apostle or to the close associate of an apostle. Most scholars have rejected the traditional attributions. The gospels of Matthew, Mark, and Luke are referred to as the Synoptic Gospels because of a similar sequence and wording. They are also composed in Koine Greek and the majority of Mark and roughly half of Matthew and Luke coincide in content, in much the same sequence, often nearly