Which jot or tittle in Scripture is not the Word of God?
Scripture is the word of God but it is not the Word. Jesus Christ is the Word.
In the beginning was the Word, and the Word was with God, and the Word was God. 2He was in the beginning with God. 3All things came into being through Him, and apart from Him nothing came into being that has come into being. 4In Him was life, and the life was the Light of men. 5The Light shines in the darkness, and the darkness did not comprehend it. (John 1:1-5)
We would have everything of Jesus even if the Bible had never been written. After all he did tell the Apostles to go and preach to all nations.
He did not tell them to carry a book since the New Testament which is the testament to Jesus had not yet been written.