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For a discussion of the concept of riba ("usury"), see note [35] on 30:39 , where this term occurs for the first time in the chronological order of revelation. The passage dealing with the prohibition of riba, which follows here, is believed to have been among the last revelations received by the Prophet. The subject of usury connects logically with the preceding long passage on the subject of charity because the former is morally the exact opposite of the latter: true charity consists in giving without an expectation of material gain, whereas usury is based on an expectation of gain without any corresponding effort on the part of the lender.
Lit., "like".
Lit., "he to whom an admonition has come from his Sustainer".
An apt simile: whereas legitimate trade or industry increases the prosperity and stability of men and nations, a dependence on Usury would merely encourage a race of idlers, cruel blood-suckers, and worthless fellows who do not know their own good and are therefore akin to madmen.
Owing to the fact that interest occupies a central position in modern economic life, and specially since interest is the very life blood of the existing financial institutions, a number of Muslims have been inclined to interpret it in a manner which is radically different from the understanding of Muslim scholars throughout the last fourteen centuries and is also sharply in conflict with the categorical statements of the Prophet (peace be on him). According to Islamic teachings any excess on the capital is riba (interest). Islam accepts no distinction, in so far as prohibition is concerned, between reasonable and exorbitant rates of interest, and thus what came to be regarded as the difference between usury and interest; nor between returns on bonus for consumption and those for production purposes and so on.
Usury is condemned and prohibited in the strongest possible terms. There can be no question about the prohibition. When we come to the definition of Usury there is room for difference of opinion. Hadhrat 'Umar, according to Ibn Kathir, felt some difficulty in the matter, as the Apostle left this world before the details of the question were settled. This was one of the three questions on which he wished he had more light from the Prophet. Our 'Ulama, ancient and modern, have worked out a great body of literature on Usury, based mainly on economic conditions as they existed at the rise of Islam.