Jesus said “Fear not; I am the first and last: I am he that liveth, and was dead; and, behold, I am alive for evermore.”
World Book Dictionary defines form as shape of a body, the way a thing exists, takes shape, or shows itself; manifestation. God formed Himself a body in the womb of Mary. Jesus, the Christ, was the one God manifested in the flesh. Since God is spirit (See John 4:24), He could not been seen unless He takes a form.