Send us a text In the nineteenth and twentieth centuries, various Islamic trends influenced Islamic law and thought. The debate on interest and conventional banking did not escape these intellectual trends. It is largely accepted that the primary sources of Islamic law are the Qur’ān and the Sunna. Although there are differences as to what parts of the Sunna are deemed authentic, there is little debate among the various schools of thought that the Qur’ān and Sunna formulate the scriptural bas...