Lying is one of the most evil characteristics, which all religions and systems of ethics warn against and which mans innate common sense (Fitrah) agrees that it is wrong. Those who possess chivalry and sound reason also say this.
Truthfulness is one of the pillars on which the moral survival of the world depends. It is the foundation of praiseworthy characteristics, the cornerstone of Prophethood, the result of taqwah. Were it not for truthfulness, the rulings of all divinely-revealed laws would collapse. Acquiring the characteristic of lying is akin to shedding ones humanity, because speaking is an exclusively human trait.
(Bareeqah Mahmoodiyyah, Muhammad al-Khaadimi, 3/183)
Our purely monotheistic Shariah warns against lying in the Quran and Sunnah, and there is consensus that it is haraam. The liar will have bad consequences in this world and in the next.
According to Shariah, lying is not permitted except in specific cases which do not lead to loss of rights, bloodshed or slander of people’s honor, etc., but which concern saving lives, reconciling between people, or creating love between husband and wife.
There is a never a day or a moment when Shariah permits a person to tell lies or to say whatever he wants based on lies. One of the things that have become widespread among the common people is the so called “April Fool’s Day”, where they claim that the first day of the fourth solar month is a day when lying is permitted without being subject to any sharah guidelines.
Many bad things may result from this, some of which we will mention below.