Chapter on Guarantee
Man Lā Yaḥḍuruh al-Faqīh|Volume 3|Book 1|Chapter 38
وَ- سَأَلَ أَبُو أَيُّوبَ أَبَا عَبْدِ اللَّهِ عَلَيْهِ اَلسَّلاَمُ عَنِ الرَّجُلِ يُحِيلُ الرَّجُلَ بِالْمَالِ أَ يَرْجِعُ عَلَيْهِ قَالَ لَا يَرْجِعُ عَلَيْهِ أَبَداً إِلَّا أَنْ يَكُونَ قَدْ أَفْلَسَ قَبْلَ ذَلِكَ.
Abu Ayyub asked Abu Abdullah عليه السلام about a man who transfers a debt to another man (through a payment order or promissory note). Does the original debtor still remain liable for the payment? Imam عليه السلام replied: "No, he does not return to him (for payment) at all, except if the one to whom the debt was transferred had already declared bankruptcy before the transfer."
- Ṣaḥīḥ al-Faqīh, p. 195