Umar ibne Yazid says that, "I asked Imam Ja'far as-Sadiq (a.s.), "I have heard you saying that all our Shia's will enter Heaven however sinful they may be?" Imam replied,
"By Allah I had truly said, they shall all belong to Heaven."
Then I asked, "May my life be sacrificed upon you, even if their sins are great and in large number?" Imam said,
"All of you (Shias) shall enter Paradise by the intercession of the Holy Prophet (s.a.w.s.) or his successors on the Day of Judgement. But, by Allah I fear for you the Barzakh."
I asked,"What is Barzakh?"
He replied,
"Barzakh is the grave. Its duration commences from the time of death until the Day of Judgement."
(Al Kafi)
Tears of Blood
The Holy Prophet (s.a.w.s.) called the attention of Ibne Masud and imparted some advice to him. He said in this regard.
"Never imagine a sin to be trifle and miniature and abstain from the Greater Sins, because, on the Day of Judgement, when the slave beholds his sins, tears of blood and puss shall flow from his eyes. At that moment Allah shall say, "This is the day when everyone shall see his good or bad deeds, and wish there be a great distance between them and their sins."
(Behaarul Anwaar vol.17)
It is also related from the Holy Prophet (s.a.w.s.) that he said,
"Verily, a person shall be kept captive in Hell for a hundred years for each of the sins (that he commits)."
(Al-Kafi)
No Intercession for Those Who Regard Namaz Unimportant
Making light of Salaat is counted among the Greater Sins. It is mentioned in some reports that the one who considers the prayers unimportant is not eligible for intercession.
Thus Imam Ja'far as-Sadiq (a.s.) said:
"Our intercession is not for those who consider the Prayers unimportant."
Imam Ja'far as-Sadiq (a.s.) said:
"Our intercession is not for those who considered the Prayers lightly."
(Behaarul Anwaar vol.3)
It is related from the Holy Prophet (s.a.w.s.) that he said:
"One who considers prayers unimportant is not from me. By Allah, he is not from me. By Allah, he cannot reach near me at the Haudh-e-Kauthar." (the cistern in Paradise)
(Beharul Anwaar)
The above discussion makes it evident that not avoiding sins, committing sins blatantly and then repenting in the hope of intercession is foolishness and a sign of arrogance and negligence.
Excessive Sins Destroy the Faith (Belief)
Whatever has been mentioned in the discussion of intercession states that intercession comes to the rescue when the person concerned has died with correct belief. It happens, sometimes that, due to excessive involvement in sins and delay in repentance, faith in religion is erased from the heart. Subsequently he enters the limit of doubt and reaches the point of denial (Kufr). At this time if he is taken away by death, such a person is similar to the one who had consumed poison in the false hope that the doctor would save his life. But when the doctor arrives, death had already preceded him. What can the doctor do to cure him. In the same way the request of the intercessors is ineffective for the one who has died as an unbeliever.
"So the intercession of intercessors shall not avail them."
(Surah Muddassir 74:48)
In order to prove my statement I propose to quote one verse from the Holy Qur'an and two traditions:
"Then evil was the end of those who did evil, because they rejected the communications of Allah and used to mock them."
(Surah Rome 30:10)
Sins Blacken the Heart
The first tradition is reported from Imam Ja'far as-Sadiq (a.s.): He said,
"There is no man who does not have a white spot in his heart. When he commits a sin a black spot emerges from this spot. If he repents, the blackness goes away but if he sinks in sin and continues to sin the blackness keeps on increasing till it surrounds the whiteness of the heart completely. When the white spot is totally covered by the blackness, the owner of this heart will never revert towards goodness. This tradition is in consonance with the utterance of Allah:
"By no means! But on their hearts is the stain of the (ill) which they do."
(Surah Mutaffefeen 83:14)
The Blackened Heart is Immune to Advice and Counsel
The people with the 'blackened heart' are totally unaffected by any counsel because their sins have caused the darkness to spread all over their heart. The loss of the inner eye prevents them from perceiving truths nor can they recognise the truth when they see it. They cannot accept any exhortation and revert to the path of virtue. It is in this connection that Imam Ja'far as-Sadiq (a.s.) explains:
"A man resolves to perform a sinful action but does not act upon it, but sometimes does commit it; Allah sees him and says: "By My Glory, after this I shall never forgive you."
According to another report, the person (sinner) is kept away from the Mercy of Allah due to his sin. He also does not get the impetus to seek repentance, hence his sin is never forgiven. Allama Majlisi (r.a.) writes in the explanatory note of the above tradition: "The purport of this tradition of Imam Ja'far as-Sadiq (a.s.) is that, the Imam has commanded us to fear all types of sins because every sin seems to be such that it may not qualify being overlooked.
To Be Fearful of the Past Sins
The believing people should always be fearful of the sins committed in the past and should mourn for them since we do not know which of our sins can bring about out destruction. The Imam (a.s.) has not informed us of any sin that we can ignore and remain bereft of the Mercy of Allah. However, it is certain that the sin for which we have not repented would be sure to prevent our salvation. So we must enter the domain of Allah's grace through the door of repentance. We should sincerely repent for those sins, which are forgotten by us and especially seek forgiveness of those sins that we remember. The method of repenting shall be explained later Inshallah.
Intercession Should Neither Raise False Hope, Nor be a Cause to be Arrogant
The preceding discussion has shown that the element of intercession does not become the cause of arrogance and disobedience. Rather, intercession imparts strength to the sinner in a state of despair. It creates in him the habit of repenting with fervour. Consequently, he would be able to reach a high position and achieve nearness to the Lord of the Worlds.
The Fear and Dread of Sins is Still Necessary
It should not be so, that a person is hopeful of intercession and is negligent at the same time. Along with the hope of intercession the fear of Allah is also a must. Because fear is not contrary to intercession. The one who is hopeful of the grace and mercy of the Almighty Lord may also experience fear. Otherwise he may not be able to obtain intercession of his masters [The Holy Prophet (s.a.w.s.) and the Imams (a.s.)] for a very long time. In other words, such a person would be able to receive intercession only after being afflicted with the punishment of the grave for a long period of time. In the meantime the fear, awe, agony, suffering and misery that he is experiencing, may become the cause for him to receive intercession of the purified Ahlul Bayt (a.s.). It may also spur him to be attached to them steadily.
The Shias of Ahlul Bayt (a.s.)
One of the traditions concerning the position of the Shias and the lovers of Ahlul Bayt (a.s.) states that the fire of Hell cannot scorch them. Thus, these types of traditions impart strength to our hope. Our love for the Ahlul Bayt (a.s.) is certainly a surety for us but it should not tempt us to commit sins blatantly.
Shia and Mohib
The traditions regarding this subject are based on two important points. The first is concerned with 'Shia' and the second 'Mohibs' (Admirers) of the Holy Ahlul Bayt (a.s.). The position and status of those Shias who have achieved excellence in the field of knowledge and good deeds is definitely higher. Even so, such people did not consider themselves fit to be called the Shias of Ahlul Bayt (a.s.). Take the example of Muhammad bin Muslim Thaqafi. He was the honourable companion (Sahaabi) of Imam Muhammad Baqir (a.s.) and Imam Ja'far as-Sadiq (a.s.). Both the Holy Imams (a.s.) have recommended him to the Shias for solving their religious problems. Muhammad bin Muslim Thaqafi has also been mentioned as the greatest Jurist of his time in the books of Rijal (Chain of narrators).
On one occasion Muhammad bin Muslim along with Abu Karibatul Azdi went to see Qazi Shareek. Shareek glared at him inrage and said, "These two are Ja'fari and Fatimi!" [Shias of Ahlul Bayt (a.s.)]. Upon hearing this, both of them began to cryharshly. When the Qazi enquired the reason for their lamentation, they replied, "You have associated us with such a lofty personality [Imam Ja'far as-Sadiq (a.s.)]!. Are people like us who lack in piety and abstinence to be compared with such an exalted person? What connection does the dust have with the Divine existence? (A Persian saying). We shall be highly obliged to you if you can accept our appeal (and give us not the title that we do not deserve)."
source : GREATER SINS by Ayatullah-ul-Uzma Sayed Abdul Husain Dastghaib Shirazi (r.a.)