Proverbs 14:25

25 A witness of truth delivereth souls; But he who breathes out lies is nothing but deception. When men, in consequence of false suspicions or of false accusations, fall into danger of their lives (דיני נפשׁות is the designation in the later language of the law of a criminal process), then a tongue which, pressed by conscientiousness and not deterred by cowardice, will utter the truth, saves them. But a false tongue, which as such (vid., Pro 14:5) is a יפח כזבים (after the Masora at this place ויפח, defective), i.e., is one who breathes out lies (vid., regarding יפיח at Pro 6:19), is mere deception (lxx, without reading מרמּה [as Hitzig does]: δόλιος). In Pro 12:17 מרמה is to be interpreted as the object. accus. of יגיד carried forward, but here to carry forward מצּיל (Arama, Lwenstein) is impracticable - for to deliver deceit = the deceiver is not expressed in the Hebr. - מרמה is, as possibly also Heb 12:16 (lxx δόλιος), without אישׁ or עד being supplied, the pred. of the substantival clause: such an one is deception (in bad Latin, dolositas), for he who utters forth lies against better knowledge must have a malevolent, deceitful purpose.

See here, 1. How much praise is due to a faithful witness: He delivers the souls of the innocent, who are falsely accused, and their good names, which are as dear to them as their lives. A man of integrity will venture the displeasure of the greatest, to bring truth to light and rescue those who are injured by falsehood. A faithful minister, who truly witnesses for God against sin, is thereby instrumental to deliver souls from eternal death. 2. How little regard is to be had to a false witness. He forges lies, and yet pours them out with the greatest assurance imaginable for the destruction of the innocent. It is therefore the interest of a nation by all means possible to detect and punish false-witness-bearing, yea, and lying in common conversation; for truth is the cement of society.