John 5:33

5:33 You have sent to John, and he has testified to the truth.

John 5:37

5:37 And the Father who sent me has himself testified about me. You people have never heard his voice nor seen his form at any time,

John 19:35

19:35 And the person who saw it has testified (and his testimony is true, and he knows that he is telling the truth), so that you also may believe.