'Faithful' in the Bible

How is the faithful city become a harlot! It was full of judgment; righteousness used to lodge in it, but now murderers.

and I will restore thy judges as at the first, and thy counsellors as at the beginning. Afterwards thou shalt be called, Town of righteousness, Faithful city.

Thus saith Jehovah, the Redeemer of Israel, his Holy One, to him whom man despiseth, to him whom the nation abhorreth, to the servant of rulers: Kings shall see and arise, princes, and they shall worship, because of Jehovah who is faithful, the Holy One of Israel, who hath chosen thee.