'Faithful' in the Bible

{To the chief Musician. Upon Sheminith. A Psalm of David.} Save, Jehovah, for the godly man is gone; for the faithful have failed from among the children of men.

Love Jehovah, all ye his saints. Jehovah preserveth the faithful, and plentifully requiteth the proud doer.

Mine eyes shall be upon the faithful of the land, that they may dwell with me; he that walketh in a perfect way, he shall serve me.

The works of his hands are truth and judgment; all his precepts are faithful: