Rule about Unlawful Interest
Al-Kāfi|Volume 5|Book 2|Chapter 51
12- أَحْمَدُ بْنُ مُحَمَّدٍ عَنِ ابْنِ فَضَّالٍ عَنْ أَبِي جَمِيلَةَ عَنْ سَعْدِ بْنِ طَرِيفٍ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ السَّلام) قَالَ أَخْبَثُ الْمَكَاسِبِ كَسْبُ الرِّبَا.
12. Ahmad ibn Muhammad from has narrated from ibn Faddal from abu Jamilah from Sa‘d ibn Tarif who has said the following: “Abu Ja’far عليه السلام, has said, ‘The filthiest earning is earning by means of Riba , . ,,,
- Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (19/126)
- Ṣaḥīḥ al-Kāfī