Siddiqi, Mohammad Nejatullah 1 January 2004 | Those who equate riba with interest seek support from al-Jassas, who claimed that pre-Islamic Arabia practiced a form of riba where money was lent at a predetermined sum over the principal amount |
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Encyclopedia of Islam and the Muslim World | 981] no date , Ahkam al-Quran, V |
"Riba and Interest in Islamic Banking: an Historical Review" | |
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The Oxford Dictionary of Islam |