Hadith 1:

خَبَرٌ آخَرُ رُوِيَ عَنِ الْإِمَامِ الصَّادِقِ ع‌ أَنَّهُ كَانَ جَالِساً فِي الْحَرَمِ فِي مَقَامِ إِبْرَاهِيمَ ع فَجَاءَهُ رَجُلٌ شَيْخٌ كَبِيرٌ قَدْ فَنِيَ عُمُرُهُ فِي الْمَعْصِيَةِ فَنَظَرَ إِلَى الصَّادِقِ ع فَقَالَ نِعْمَ الشَّفِيعُ إِلَى اللَّهِ لِلْمُذْنِبِينَ ثُمَّ أَخَذَ بِأَسْتَارِ الْكَعْبَةِ وَ أَنْشَأَ يَقُولُ‌

بِحَقِّ جِلَاءِ وَجْهِكَ يَا وَلِيِّي‌ , بِحَقِّ الْهَاشِمِيِّ الْأَبْطَحِيِ‌

بِحَقِّ الذِّكْرِ إِذْ يُوحَى إِلَيْهِ‌ , بِحَقِّ وَصِيِّهِ الْبَطَلِ الْكَمِيِ‌

بِحَقِّ أَئِمَّةٍ سَلَفُوا جَمِيعاً , عَلَى مِنْهَاجِ جَدِّهِمُ النَّبِيِ‌

بِحَقِّ الْقَائِمِ الْمَهْدِيِّ إِلَّا , غَفَرْتَ خَطِيئَةَ الْعَبْدِ الْمُسِي‌ءِ

قَالَ فَسَمِعَ هَاتِفاً يَقُولُ يَا شَيْخُ كَانَ ذَنْبُكَ عَظِيماً وَ لَكِنْ غَفَرْنَا لَكَ جَمِيعَ ذُنُوبَكَ لِحُرْمَةِ شُفَعَائِكَ فَلَوْ سَأَلْتَنَا ذُنُوبَ أَهْلِ الْأَرْضِ لَغَفَرْنَا لَهُمْ غَيْرَ عَاقِرِ النَّاقَةِ وَ قَتَلَةِ الْأَنْبِيَاءِ وَ الْأَئِمَّةِ الطَّاهِرِينَ.

Narrated that once Imam Sadiq (عليه السلام) was sitting in the Haram (Holy Kaba) at the station (maqam) of Abraham (ع), when an old man came to him. The man had spent his entire life in disobedience. He looked at Imam al-Sadiq (عليه السلام) and said, "Great intercessor to Allah for the sinners!" Then he took hold of the curtains of the Kaaba and began to recite the following poem:

By the right of the radiance of Your face, O my Master,

By the right of the Hashemite al-Abtahee (resident of Mecca, i.e. Prophet Muhammad ص)

By the right of the Remembrance (Zekr) when it is revealed to Him,

By the right of His Successor, the hero/champion, and the brave,

By the right of all the Imams who have preceded on the path of their grandfather the Prophet (ص),

By the right of the Qaim al-Mahdi (عليه السلام) - You forgive the sin of the sinful servant.

He said, "Then he heard a voice calling, 'O old man, your sin was great, but We have forgiven you all your sins due to the respect/esteem (Hurmat) of your intercessors. If you had asked Us for the sins of the people of the earth, We would have forgiven them, except for the one who killed the she-camel (of Prophet Saleh), and the killers of the Prophets and the pure Imams."

 [Source: al-Fazail, Shazan bin Jibrael al-Qummi, Pg. 66]