We can say, without doubt that, lying is one of the most evil
characteristics, of which all religions and systems of ethics warn
against and which man's innate common sense (Fitrah) agrees that it is
wrong. Any who possess normal chivalry and sound reason would be
obliged to say the same.
Truthfulness is one of the pillars on which the moral survival of the
world depends. It is the foundation of praiseworthy characteristics,
the foundation of prophethood, the result of taqwah. Were it not for
truthfulness, the rulings of all divinely-revealed laws would collapse.