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 studying the reliability of the gospels, as Acts was seemingly written by the same author as the "Gospel of Luke". Historians subject the gospels to critical analysis, attempting to differentiate, rather than authenticate, reliable information from possible inventions, exaggerations, and alterations. Since there are more than 15,000 New Testament manuscripts which present hundreds of thousands of textual variants, scholars use textual criticism to determine which gospel variants could theoretically be taken as 'original'. To answer this question, scholars have to ask who wrote the gospels, when they wrote them, what was their objective in writing them, what sources the authors