John 6:51
I am the living bread that came down from heaven; whoever eats this bread will live forever; and the bread that I will give is my flesh for the life of the world."
Jesus is the living bread that came down from Heaven, how can that be made any more clearer? Jesus is a living being and came down from Heaven. Do you think it's some foreign idea that Jesus was preexistent? That is an inherently Christian belief and is integrated in scripture.
Jesus was there in the beginning, He is before all things. He is the First and the Last.