In its primary sense, the word of God is none other than God. This is supported by the first verses of the gospel of John, where it is written that “in the beginning was the Word, and the Word was with God, and the Word was God.” The bible itself declares that, strictly speaking, the Word of God is none other than God the Son, the Second Person of the Trinity, the Word who was made flesh and dwelt among us.
Therefore, when God speaks, we are not simply given information; also, and above all, God acts. This is what is meant in the book of Genesis, where the Word of God is a creating force: “God said, let there be … and there was.” When God speaks, that which is uttered is also created. God’s Word, besides telling us something, creates something in us and in all creation. That creative and powerful Word is Christ, whose incarnation is both God’s greatest revelation and God’s greatest action. In Jesus, God was revealed to us. And also in Jesus, God overcame the powers of evil that held us in subjection. God’s revelation is also God’s victory.
Anyone who reads the Bible and somehow does not find Jesus in it, has not encountered the Word of God!
Justo L. Gonzalez on Martin Luther’s doctrine of the Word from his book “The Story of Christianity: Volume II – The Reformation to the Present Day” on pages 47-48