'Faithful' in the Bible

How the faithful city has become a prostitute! She was full of justice; righteousness lodged in her, but now murderers.

I will restore your judges as at the first, and your counselors as at the beginning. Afterward you shall be called 'The city of righteousness, a faithful town.'

and I will take for myself faithful witnesses to testify: Uriah the priest, and Zechariah the son of Jeberechiah."

Thus says Yahweh, the Redeemer of Israel, [and] his Holy One, to him whom man despises, to him whom the nation abhors, to a servant of rulers: "Kings shall see and arise; princes, and they shall worship; because of Yahweh who is faithful, [even] the Holy One of Israel, who has chosen you."