Jesus is the Word of God. How do we know this? The first five verses of the Gospel of John tell us this, leaving no doubt about this fact. Jesus IS the Word of God!
All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness, that the man of God may be complete, thoroughly equipped for every good work. (2 Timothy 3:16-17 NKJV)