al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
٤٤٧. وَقَالَ (عليه السلام): مَنِ اتَّجَرَ بِغَيْرِ فِقْهٍ فَقَدِ ارْتَطَمَ فِي الرِّبَا.
447. Amīr al-mu’minīn, peace be upon him, said: Whoever trades without knowing the rules of religious law will be involved in usury.
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