Authorship Question

The Pentateuch goes back in his core certainly to Moses himself. However, whether the old Jewish-Christian tradition is right, that really  everything was written by Moses himself, is very questionable, is also  nowhere claimed in the scripture itself (so already Delitzsch, 38ff). Since  this has in any case no support in the Bible itself, the statement seems  very daring that a denial of the total authorship of Moses questions the  credibility of the Bible (so Ellison, p. 22). 

The Pentateuch is rather an example of the so-called traditional literature,  as it was common at that time. Here, a core scripture is enriched by  other writers over time. The most beautiful example is the Psalter of  David, in which besides the Psalms marked as Davidic also Psalms of  Korah, Asaph, Solomon and others are included. Earlier times rightly  regarded this as an enrichment and not, as many do today, as a  “forgery”. This is more a problem of consciousness of modern man  brought into the Bible than a problem of the Bible. Delitzsch assumes  (p.38) that Eleazar, the son of Ahron, completed the work of Moses. But  also this is a pure hypothesis. In any case, the text version received by  the synagogue is binding as a basis of faith, which was established and  adopted as canonical by the old church in the form in which it is  available to us today.