Synoptic Gospels texts of the three synoptic gospels often agree very closely in wording and order, both in quotations and in narration. Most scholars ascribe this to "documentary dependence", direct or indirect, meaning the close agreements among synoptic gospels are due to one gospel's drawing from the text of another, or from some written source that another gospel also drew from. The synoptic problem hinges on several interrelated points of controversy: Furthermore, some theories try to explain the relation of the synoptic gospels to John; to non-canonical gospels such as Thomas, Peter, and Egerton; to the Didache; and to lost documents such
New Testament as citations of the New Testament by ancient authors and the New Testament text in lectionaries in order to reconstruct the earliest recoverable form of the New Testament text and the history of changes to it. Books that later formed the New Testament, like other Christian literature of the period, originated in a literary context that reveals relationships not only to other Christian writings, but also to Graeco-Roman and Jewish works. Of singular importance is the extensive use of and interaction with the Jewish Bible and what would become the Christian Old Testament. Both implicit and explicit citations, as well