'Bear Witness' in the Bible

The same came for a witness, to bear witness of the Light, that all men through him might believe.

He was not that Light, but was sent to bear witness of that Light.

And they came unto John, and said unto him, Rabbi, he that was with you beyond Jordan, to whom you bear witness, behold, the same baptizes, and all men come to him.

If I bear witness of myself, my witness is not true.

But I have greater witness than that of John: for the works which the Father has given me to finish, the same works that I do, bear witness of me, that the Father has sent me.

I am one that bear witness of myself, and the Father that sent me bears witness of me.

Jesus answered them, I told you, and you believed not: the works that I do in my Father's name, they bear witness of me.

And you also shall bear witness, because you have been with me from the beginning.

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

Pilate therefore said unto him, Are you a king then? Jesus answered, You say that I am a king. To this end was I born, and for this cause came I into the world, that I should bear witness unto the truth. Every one that is of the truth hears my voice.