Do you reduce Him to a mere prophet who needs validation by scripture?.
Read the verses at the link and see what Jesus has to say about Himself and His relation to Scripture.
John 5:39 You search the Scriptures because you think that in them you have eternal life; and it is they that bear witness about me,
You may wish to read the passage, and not merely the verse to get the meaning of what Jesus is saying here. Who is He rebuking, why, and how?