'Faithful Witness' in the Bible

And I will take to Myself faithful witnesses for testimony, Uriah the priest and Zechariah the son of Jeberechiah.”

Then they said to Jeremiah, “May the Lord be a true and faithful witness against us if we do not act in accordance with the whole message with which the Lord your God will send you to us.

and from Jesus Christ, the faithful witness, the firstborn of the dead, and the ruler of the kings of the earth. To Him who loves us and released us from our sins by His blood—