Chapter on Usury (Riba)
Man Lā Yaḥḍuruh al-Faqīh|Volume 3|Book 2|Chapter 27
وَ رَوَى جَمِيلٌ عَنْ زُرَارَةَ عَنْ أَبِي جَعْفَرٍ عَلَيْهِ اَلسَّلاَمُ قَالَ: "اَلدَّقِيقُ بِالْحِنْطَةِ وَ اَلسَّوِيقُ بِالدَّقِيقِ مِثْلاً بِمِثْلٍ لاَ بَأْسَ بِهِ ".
Jamil narrated from Zurarah, from Abu Ja'far Imam Muhammad ibn Ali Al-Baqir عليه السلام, who said: "Flour in exchange for wheat, and parched flour in exchange for regular flour, if it is equal in measure, there is no harm in it."
- Ṣaḥīḥ al-Faqīh, p. 245