'Faithful' in the Bible

How the faithful city has become a prostitute [idolatrous, despicable],She who was full of justice!Right standing with God once lodged in her,But now murderers.

“Then I will restore your judges as at the first,And your counselors as at the beginning;Afterward you will be called the city of righteousness,The faithful city.”

And I will get faithful witnesses to attest [to this prophecy] for me, Uriah the priest and Zechariah the son of Jeberechiah.”

This is what the Lord, the Redeemer of Israel, Israel’s Holy One says,To the thoroughly despised One,To the One hated by the nationTo the Servant of rulers,“Kings will see and arise,Princes shall also bow down,Because of the Lord who is faithful, the Holy One of Israel who has chosen You.”