The final statement in the New World presentation of the teachings of the Old World echo the final imagery of the Sermon on the Mount. The teachings have been presented, not it remains to us to live them. This is presented in the very tight parallel statement:
I have given unto you the commandments
Therefore keep my commandments.
Literary Referent: The final phrase echoes language found in John:
John 5:39
39 ¶ Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me.
The Johnanine context was one of mild derision of those who could proclaim to be experts in scripture but not understand that those scriptures testified of Jesus as the Atoning Messiah. In this echo of the vocabulary in the New World there is no such contextual derision. This is a very basic claim that what Jesus has taught them is the fulfillment of the “law and the prophets.” This particular phrasing is a designation for the scriptures. Thus Christ is declaring that he has taught them the gospel, and that this gospel and his mission are the fulfillment of scripture.