It is deduced from different traditions that lie is not in concord with belief, and lying is the sign of a sort of unbelief.
These traditions have been inspired by Holy Quran where it says:
اِنَّما یَفْتَرِی الْکَذِبَ الَّذِینَ لا یُؤْمِنُونَ بِآیاتِ اللهِ وَ اُولئِکَ هُمُ الْکاذِبُونَ).
They only forge falsehood, who believe not in the signs of God, and those -–they are liars.
Forge falsehood may refer to deliberate falsehood.
And now some of the narrations:
«سُئِلَ رَسُولُ اللهِ(صلى الله علیه وآله) : یَکُونُ الْمُؤْمِنُ جَباناً؟ قالَ: نَعَمْ. قِیلَ: وَ یَکُونُ بَخِیلا؟ قالَ: نَعَمْ. قِیلَ: وَیَکُونُ کَذّاباً؟ قال: لا».
The Prophet S.A. was asked: Is it possible for a believer to be coward? He answered: yes. It was asked: Is it possible for him to be stingy? He answered: yes. It was asked: Is it possible for him to be liar? He answered: no.
«قالَ اَمِیرُ الْمُؤْمِنِینَ(علیه السلام): لا یَجِدُ عَبْدٌ طَعْمَ الاِْیمانِ حَتّى یَتْرُکَ الْکَذِبَ هَزْلَهُ وَجِدَّهُ».
Imam Ali A.S. said: A man does not taste the taste of belief, unless he refuses lie, either seriously or for humor.
«عنه (علیه السلام): جانِبُوا الْکَذِبَ فَاِنَّهُ مُجانِبُ الاِْیمانِ».
Avoid lie, which is not in concord with belief.
And it is concluded from these narrations that believers avoid lie, and belief and lie do never accompany each other.
This point refers to the fact that the liars do not easily accept invitation of the prophets based on self-comparison. Since they themselves lie in little affairs of life, they can not believe that prophets to be really truthful in such big affairs. They may be among the believers, but if we explore in depth of their hearts, we will find that it is not free from doubt and suspicion. Of course, this is true for those whose life is overshadowed by lie, and as interpreted in the tradition are liars.
The contrary is also true. That is to say the truthful people are often credulous, because they themselves are truthful and honest, and accept whatever they hear based on their superior nature, and so called they are ear unless they are notified.
Liars have a special pessimism and suspicion on everybody and everything. They assume everything false, untrue, or at least suspicious. How it is possible for such people to believe in all speeches of prophets without any doubt and suspicion. So we see in the history that hypocrite, deviated and liar individuals often attributed lying to divine prophets.
The issue of self-comparison is one of the mental conditions in man, which could serve as the key for solving a lot of problems. It is often observed that unusual movements of criminal, thief and treacherous individuals acquaint the others. Since they are aware of their own condition, they suppose the same about the others, and so try to conceal themselves, and such unusual movements attract the attention of others.
1- The Bee sura (16), verse 105
2- Majlessi, Beharol Anvar, 262/72
3- Majlessi, Beharol Anvar, 249/72
4- The same document, volume 78, page 9
