John 5:33

Jesus knew that His critics would not accept the Father’s witness to His identity even though Jesus claimed that His words accurately represented the Father’s will. He could not prove this claim to their satisfaction. Therefore He cited another human witness who testified about Jesus’ identity, namely, John the Baptist. John came into the world to bear witness to the light (John 1:7). Moreover he had borne witness about Jesus to the Jews who had come from Jerusalem to ask who He was (John 1:19-28). Furthermore he had identified Jesus publicly as the Lamb of God (John 1:29-34). John had truly testified that Jesus was the divine Messiah (cf. John 1:40-41).