Chapter on Usury (Riba)
Man Lā Yaḥḍuruh al-Faqīh|Volume 3|Book 2|Chapter 27
رَوَى اَلْحُسَيْنُ بْنُ اَلْمُخْتَارِ عَنْ أَبِي بَصِيرٍ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ قَالَ: "دِرْهَمٌ رِبًا أَشَدُّ عِنْدَ اَللَّهِ عَزَّ وَ جَلَّ مِنْ ثَلاَثِينَ زَنْيَةً كُلُّهَا بِذَاتِ مَحْرَمٍ مِثْلِ اَلْخَالَةِ وَ اَلْعَمَّةِ".
Al-Husayn ibn al-Mukhtar narrated from Abu Basir, from Abu Abdullah عليه السلام, who said: "One dirham of usury is more severe in the sight of Allah سبحانه وتعالى, the Almighty and Majestic, than thirty acts of fornication, all of which are committed with forbidden relatives, such as a maternal aunt or a paternal aunt."
- Ṣaḥīḥ al-Faqīh