Al-Kāfi - Volume 7 > The Will and Debts
Hadith #5

5- مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ الْحَسَنِ بْنِ مَحْبُوبٍ عَنْ عَبْدِ اللهِ بْنِ سِنَانٍ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) فِي الرَّجُلِ يَمُوتُ وَعَلَيْهِ دَيْنٌ فَيَضْمَنُهُ ضَامِنٌ لِلْغُرَمَاءِ قَالَ إِذَا رَضِيَ الْغُرَمَاءُ فَقَدْ بَرِئَتْ ذِمَّةُ الْمَيِّتِ.

5. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from al-Hassan ibn Mahbub from ‘Abd Allah ibn Sinan who has narrated the following: “About the case of a man who dies with debts on him and a guarantor takes responsibility to pay the creditors, abu ‘Abd Allah, ‘Alayhi al-Salam, has said, ‘If the creditors agree, the deceased becomes free from responsibility.”’