Sources for the historicity of Jesus and actions attributed to him. Three of these (Matthew, Mark, and Luke) are known as the synoptic Gospels, from the Greek σύν (syn "together") and ὄψις (opsis "view"), given that they display a high degree of similarity in content, narrative arrangement, language and paragraph structure. The presentation in the fourth canonical gospel, i.e. John, differs from these three in that it has more of a thematic nature rather than a narrative format. Scholars generally agree that it is impossible to find any direct literary relationship between the synoptic gospels and the Gospel of John. The authors of the New Testament
Treatise on the Resurrection texts found at Nag Hammadi. It alludes to the account of the Transfiguration found in Mark, saying, "Do you remember reading in the Gospel how Elijah and Moses appeared?" Hence, the text indicates that the author accepted Mark's synoptic gospel narrative as a sacred text. Unlike many other texts found at Nag Hammadi, The Treatise on the Resurrection is not pseudepigraphal, since the author does not pretend to be a great apostolic figure who received a special revelation. The text is simply a letter to someone named Rheginos, and hence belongs to a genre more akin to the New Testament