'Witness' in the Bible

and from Jesus Christ, the faithful witness, the first-born out of the dead, and the ruler of the kings of the earth; to him who did love us, and did bathe us from our sins in his blood,

I have known thy works, and where thou dost dwell -- where the throne of the Adversary is -- and thou dost hold fast my name, and thou didst not deny my faith, even in the days in which Antipas was my faithful witness, who was put to death beside you, where the Adversary doth dwell.

And to the messenger of the assembly of the Laodiceans write: These things saith the Amen, the witness -- the faithful and true -- the chief of the creation of God;