Lying is a very bad habit which must be avoided.Many people tell lies without any sound reason and do not take it as a sin . 

Some people tell lies just for the sake of joke and think that they have done a great job where as some other tell lies to sell the things and take it as a tool of trade where as another group tell lies to cheat the people and they are happy by making people fool.

All these people should bear in mind that lying is a big sin ad has been condemned by Allah and His Rasool salal laho aliehi wasalam.On one instance Rasool salal laho aliehi wasalam said:

Truthfulness leads to righteousness, and righteousness leads to Paradise. And a man keeps on telling the truth until he becomes a truthful person.Falsehood leads to Al-Fajur (i.e. wickedness, evil-doing), and Al-Fajur (wickedness) leads to the (Hell) Fire, and a man may keep on telling lies till he is written before Allah, a liar.(Sahih Bukhari :Volume 8, Book 73, Hadith 116).

May Allah swt save us from telling lies and give us taufeeq to say truth Ameen.