'Faithful Witness' in the Bible

It shall be established for ever as the moon, and as a faithful witness in heaven. Selah.

A faithful witness will not lie: but a false witness will utter lies.

And I took to me faithful witnesses to record, Uriah the priest, and Zechariah the son of Jeberechiah.

Then they said to Jeremiah, The LORD be a true and faithful witness between us, if we do not even according to all things for which the LORD thy God shall send thee to us.

And from Jesus Christ, who is the faithful witness, and the first-begotten of the dead, and the prince of the kings of the earth. To him that loved us, and washed us from our sins in his own blood,