'Faithful Witness' in the Bible

A faithful witness will not lie; but a false witness uttereth lies.

And they said to Jeremiah, Jehovah be a true and faithful witness amongst us, if we do not even according to all the word for which Jehovah thy God shall send thee to us.

and from Jesus Christ, the faithful witness, the firstborn from the dead, and the prince of the kings of the earth. To him who loves us, and has washed us from our sins in his blood,

I know where thou dwellest, where the throne of Satan is; and thou holdest fast my name, and hast not denied my faith, even in the days in which Antipas my faithful witness was, who was slain among you, where Satan dwells.