A believer can’t lie

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Lying is one of the characteristics of the hypocrites, and it is a blameworthy trait which encourages one to commit evil and prevents one from doing good. Al-Bukhaari (6094) and Muslim (2607) narrated that Ibn Mas‘ood (may Allah be pleased with him) said: The Messenger of Allah (blessings and peace of Allah be upon him) said: “I enjoin you to be truthful, for truthfulness leads to righteousness and righteousness leads to Paradise. A man may continue to tell the truth and endeavour to be truthful until he is recorded with Allah as a speaker of truth. And beware of lying, for lying leads to wickedness and wickedness leads to Hell. A man may continue to tell lies and endeavour to tell lies, until he is recorded with Allah as a liar.” 
Assim Al Hakeem