Chapter on Usury (Riba)
Man Lā Yaḥḍuruh al-Faqīh|Volume 3|Book 2|Chapter 27
وَ- سَأَلَ يَعْقُوبُ بْنُ شُعَيْبٍ أَبَا عَبْدِ اللَّهِ عَلَيْهِ اَلسَّلاَمُ عَنِ الرَّجُلِ يُقْرِضُ الرَّجُلَ الدَّرَاهِمَ الْغِلَّةَ فَيَأْخُذُ مِنْهُ الدَّرَاهِمَ الطَّازَجِيَّةَ طَيِّبَةً بِهَا نَفْسُهُ فَقَالَ لَا بَأْسَ بِهِ وَ ذُكِرَ ذَلِكَ عَنْ عَلِيٍّ عَلَيْهِ اَلسَّلاَمُ.
Ya'qub ibn Shu'ayb asked Abu Abdullah عليه السلام about a man who lends dirhams of lower quality and then receives better-quality dirhams in return, with the borrower's consent. He عليه السلام said: "There is no harm in it." And this was also narrated from Imam Ali ibn Abi Talib عليه السلام.
- Ṣaḥīḥ al-Faqīh, p. 247