'Bear Witness' in the Bible

Truly ye bear witness that ye approve the deeds of your fathers: for whom they killed, ye build their sepulchres.

Jesus answered, If I have spoken evil, bear witness of the evil: but if well, why smitest thou me?

Pilate said to him, Art thou a king then? Jesus answered, Thou sayest. I am a king. To this end was I born, and for this cause came I into the world, that I might bear witness to the truth.