John 1:7

1:7 He came as a witness to testify about the light, so that everyone might believe through him.

John 3:32

3:32 He testifies about what he has seen and heard, but no one accepts his testimony.

John 4:44

4:44 (For Jesus himself had testified that a prophet has no honor in his own country.)

John 8:13

8:13 So the Pharisees objected, “You testify about yourself; your testimony is not true!”

John 18:23

18:23 Jesus replied, “If I have said something wrong, confirm what is wrong. But if I spoke correctly, why strike me?”