'Witness' in the Bible

who bare witness of the word of God, and of the testimony of Jesus Christ, even of all things that he saw.

and from Jesus Christ, who is the faithful witness, the firstborn of the dead, and the ruler of the kings of the earth. Unto him that loveth us, and loosed us from our sins by his blood;

I know where thou dwellest, even where Satan's throne is; and thou holdest fast my name, and didst not deny my faith, even in the days of Antipas my witness, my faithful one, who was killed among you, where Satan dwelleth.

And to the angel of the church in Laodicea write: These things saith the Amen, the faithful and true witness, the beginning of the creation of God: