John 5:37

And the Father that sent me, he hath borne witness of me. Ye have neither heard his voice at any time, nor seen his form.

Another phase of the Father's witness regarded the Son of God himself, standing bodily before their eyes. His very presence on earth was a witness from God. Here was the Seed of woman, promised from the gates of Paradise; here was one whose birth was announced by the angels of God, one whom the sword of Herod could not slay, one whose life was sinless, perfect, and beautiful, one who spake as never man spoke, one whose questions as a twelve-year-old confounded the mightiest doctors of religion, and one whose delivery into the world had been since the days of Abraham the sole purpose of God's patient forbearance with the chosen people. Jesus' very person, in the full glory of his perfection, was truly the Father's witness of himself.

Ye have neither heard his voice ... seen his form ... How blind they were and deaf, that, in the presence of Christ himself, they could hear nothing but the voice of their own prejudice and see nothing but a contradiction of their picayune sabbath rules. How insensitive are all who will not believe in Jesus!