✅ Answer: Please refer to the following narrations:

1⃣عَنْ عَمْرِو بْنِ یَزِیدَ قَالَ: قُلْتُ لِأَبِی عَبْدِ اللَّهِ إِنِّی سَمِعْتُکَ وَ أَنْتَ تَقُولُ کُلُّ شِیعَتِنَا فِی الْجَنَّةِ عَلَی مَا کَانَ فِیهِمْ قَالَ صَدَقْتُکَ کُلُّهُمْ وَ اللَّهِ فِی الْجَنَّةِ قَالَ قُلْتُ جُعِلْتُ فِدَاکَ إِنَّ الذُّنُوبَ کَثِیرَةٌ کِبَارٌ فَقَالَ أَمَّا فِی الْقِیَامَةِ فَکُلُّکُمْ فِی الْجَنَّةِ بِشَفَاعَةِ النَّبِیِّ الْمُطَاعِ أَوْ وَصِیِّ النَّبِیِّ وَ لَکِنِّی وَ اللَّهِ أَتَخَوَّفُ عَلَیْکُمْ فِی الْبَرْزَخِ قُلْتُ وَ مَا الْبَرْزَخُ قَالَ الْقَبْرُ مُنْذُ حِینِ مَوْتِهِ إِلَی یَوْمِ الْقِیَامَةِ.

📚 Al-Kafi, Vol. 3, p. 242

Amr bin Yazid said: I asked Imam Sadiq (peace be upon him): I heard you say, 'All our Shia, despite what is within them, will be in Paradise!' The Imam replied: 'I spoke the truth! By Allah, all of them will be in Paradise!' I said: 'May I be your ransom! The sins are many and great!' The Imam said: 'But on the Day of Resurrection, all of you will be in Paradise through the intercession of the Prophet (peace be upon him and his family) or his successor. However, by Allah, I fear for you in Barzakh!' I asked: 'What is Barzakh?' He replied: 'The grave, from the moment of death until the Day of Resurrection!'

📚 Al-Kafi, Vol. 3, p. 242

2⃣عَنْ بَشِیرٍ الدَّهَّانِ عَنْ أَبِی عَبْدِ اللَّه قَالَ: إِنَّ لِلْقَبْرِ کَلَاماً فِی کُلِّ یَوْمٍ یَقُولُ أَنَا بَیْتُ الْغُرْبَةِ أَنَا بَیْتُ الْوَحْشَةِ أَنَا بَیْتُ الدُّودِ أَنَا الْقَبْرُ أَنَا رَوْضَةٌ مِنْ رِیَاضِ الْجَنَّةِ أَوْ حُفْرَةٌ مِنْ حُفَرِ النَّارِ.

Imam Sadiq (peace be upon him) said: 'The grave speaks every day, saying: I am the house of loneliness! I am the house of fear! I am the house of worms! I am the grave! I am a garden from the gardens of Paradise, or a pit from the pits of Hell!'

📚 Al-Amali by Al-Tusi, p. 38

3⃣کَتَبَ أَمِیرُ الْمُؤْمِنِینَ علیه السلام لِمُحَمَّدِ بْنِ أَبِی بَکْرٍ یَا عِبَادَ اللَّهِ مَا بَعْدَ الْمَوْتِ لِمَنْ لَا یُغْفَرُ لَهُ أَشَدُّ مِنَ الْمَوْتِ الْقَبْرُ فَاحْذَرُوا ضِیقَهُ وَ ضَنْکَهُ وَ ظُلْمَتَهُ وَ غُرْبَتَهُ...وَ إِنَّ الْمَعِیشَةَ الضَّنْکَ الَّتِی حَذَّرَ اللَّهُ مِنْهَا عَدُوَّهُ عَذَابُ الْقَبْرِ....

Amir al-Mu'minin (peace be upon him) wrote to Muhammad bin Abi Bakr: 'O servants of Allah! After death, for one who is not forgiven, the grave is more severe than death itself! Beware of the narrowness, darkness, and isolation of the grave! ... Indeed, the tight and constrained life Allah has warned His enemy of in Surah Taha (20:124) refers to the punishment of the grave!'

📚 Ilal al-Sharayi, Vol. 1, p. 292

4⃣عَنِ السَّکُونِیِّ عَنِ الصَّادِقِ عَنْ آبَائِهِ علیهم السلام قَالَ قَالَ رَسُولُ اللَّهِ صلی الله علیه و آله: ضَغْطَةُ الْقَبْرِ لِلْمُؤْمِنِ کَفَّارَةٌ لِمَا کَانَ مِنْهُ مِنْ تَضْیِیعِ النِّعَمِ

Imam Sadiq (peace be upon him) narrated from his ancestors that the Messenger of Allah (peace be upon him and his family) said: 'The compression of the grave for a believer is an atonement for what they have neglected or wasted in terms of blessings!'

📚 Bihar al-Anwar, Vol. 6, p. 218

5⃣قَالَ الصَّادِقُ علیه السلام الْبَرْزَخُ الْقَبْرُ وَ هُوَ الثَّوَابُ وَ الْعِقَابُ بَیْنَ الدُّنْیَا وَ الْآخِرَةِ

Imam Sadiq (peace be upon him) said: 'Barzakh is the grave, where the rewards and punishments between this world and the Hereafter occur!'

✅ Based on the above narrations and others, Barzakh is the realm of the grave that lasts from the time of a person's death until the Day of Resurrection. For those who have not attained complete forgiveness before death, the grave may entail difficulties such as punishment, compression, fear, darkness, narrowness, and isolation, depending on the type and extent of their sins. However, individuals who pass away with sound Shia beliefs, even if they have committed sins, experience these hardships as a form of purification, preparing them to enter Paradise on the Day of Resurrection through the intercession of the Prophet (peace be upon him and his family) and his progeny.

Certain sins are specifically mentioned in narrations as causes of punishment in the grave, while various deeds are recommended in narrations to rescue oneself from the fear, punishment, and compression of the grave. It is appropriate to abandon all sins and engage in righteous acts, particularly those that safeguard one in Barzakh, so that one's grave becomes a garden from the gardens of Paradise, God willing.

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اللَّهُمَّ صَلِّ عَلَی مُحَمَّدٍ وَ آلِ مُحَمَّدٍ وَ عَجِّلْ لِوَلِیِّکَ الْفَرَجَ وَ الْعَافِیَةَ وَ النَّصْر